US3889691A - Tobacco smoke filter - Google Patents

Tobacco smoke filter Download PDF

Info

Publication number
US3889691A
US3889691A US427201A US42720173A US3889691A US 3889691 A US3889691 A US 3889691A US 427201 A US427201 A US 427201A US 42720173 A US42720173 A US 42720173A US 3889691 A US3889691 A US 3889691A
Authority
US
United States
Prior art keywords
tobacco smoke
activated carbon
filter
cuprous chloride
impregnated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US427201A
Inventor
John Emery Urbanic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Calgon Carbon Corp
Original Assignee
Calgon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Calgon Corp filed Critical Calgon Corp
Priority to US427201A priority Critical patent/US3889691A/en
Priority to SE7415061A priority patent/SE407508B/en
Priority to CA215,643A priority patent/CA1026184A/en
Priority to GB5431974A priority patent/GB1458480A/en
Priority to IT54572/74A priority patent/IT1029636B/en
Priority to FR7441820A priority patent/FR2255021B1/fr
Priority to BR10654/74A priority patent/BR7410654D0/en
Priority to DE2460650A priority patent/DE2460650C3/en
Priority to CH1715474A priority patent/CH583530A5/xx
Priority to JP49147499A priority patent/JPS5134919B2/ja
Application granted granted Critical
Publication of US3889691A publication Critical patent/US3889691A/en
Assigned to CALGON CARBON CORPORATION reassignment CALGON CARBON CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: 06/28/82 Assignors: CALGON CORPORATION
Assigned to BANKERS TRUST COMPANY reassignment BANKERS TRUST COMPANY SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CALGON CARBON CORPORATION
Assigned to CALGON CARBON CORPORATION reassignment CALGON CARBON CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). RECORDED AT REEL 4398, FRAMES 398 - 427 AND REEL 4398, FRAMES 440-442. Assignors: BANKERS TRUST COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/06—Use of materials for tobacco smoke filters
    • A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
    • A24D3/163—Carbon

Definitions

  • This invention relates to a new tobacco smoke filter material useful for the removal of noxious and irritative material from tobacco smoke. More particularly, the instant invention is concerned with an improved tobacco smoke filter material comprising activated carbon impregnated with cuprous chloride; with methods for the preparation of such filter material; and with the use of such filter material for the removal of HCN from tobacco smoke.
  • constituents present in tobacco smoke formed during the act of smoking cigarettes, cigars, pipes and the like comprise combustion products derived from the tobacco and consist generally of a gaseous phase in which is carried suspended liquid droplets and/or solid particles.
  • Many of the chemical components of the gaseous phase and of the liquid droplets and solid particles are believed to be harmful to the health of the smoker and there have been proposed a variety of filtering elements to be used to clarify tobacco smoke and to remove from it components believed to be harmful.
  • cigarette filter materials are various cellulosic materials including cellulose, cellulose acetate, cotton, paper, starch, viscose rayon and the like. These materials have been fabricated into a variety of smoke-filtering elements designed for use with cigarettes, cigars and pipes either alone or in combination with a variety of adsorbants such as silica-gel, ion exchange resins, alumina, activated carbon and natural and synthetic clays. None of the commercially available filter materials, however, have proved entirely satisfactory.
  • Filter elements formed into cylinderical rings from cellulosic fibers have been found to be effective in removing from tobacco smoke a significant proportion of the liquid droplets and solid particles normally contained therein. Such filters, however, are relatively ineffective in removing gaseous components, and notably HCN, from tobacco smoke. Attempts to improve the gas adsorbing properties of such filters by incorporation therein of adsorbing materials such as those mentioned above, while showing some improvement, have been only partially effective in removing gaseous phase contaminants such as HCN due to a variety of factors including partial saturation or deactivation of adsorbant during manufacture of the filter element and in subsequent handling during the cigarette manufacturing process.
  • tobacco smoke filtering materials which comprise gas adsorbant materials of high surface area such as activated charcoal, alumina, natural and synthetic clays and silica-gel which have been impregnated with a mixture of the oxides of iron and zinc.
  • gas adsorbant materials of high surface area such as activated charcoal, alumina, natural and synthetic clays and silica-gel which have been impregnated with a mixture of the oxides of iron and zinc.
  • These tobacco smoke filtering materials have been found to be effective in the removal of gaseous contaminants including HCN from tobacco smoke (see Keith et al., US. Pat. No. 3,251365).
  • the instant invention is concerned with applicants discovery that tobacco smoke filtering materials which are highly effective in removing HCN from tobacco smoke may be prepared by impregnating granular activated carbon with an effective quantity of cuprous chloride.
  • the instant invention may be described as residing in the concept of a tobacco smoke filtering material comprising graunlar activated carbon impregnated with cuprous chloride. It is contemplated that such tobacco smoke filtering material will be incorporated into cigarette filters or into cigarette and/or cigar holders or into pipe stem filter elements for the removal of HCN from tobacco smoke.
  • the instant invention is based upon applicants discovery that activated carbon containing from 0.5 to 15 per cent by weight is highly effective in removing HCN from tobacco smoke. This result has been confirmed by actual test employing standard laboratory techniques. A typical experiment is described below.
  • Activated carbon containing 2.0 per cent by weight cuprous chloride was prepared by the method hereinafter described and was loaded into mm standard cigarettes with 20 mm filter cavities between two cellulose acetate filter plugs. Approximately mg. of impregnated activated carbon was loaded into each cigarette to provide a filter length of about 4 mm. of carbon.
  • This carbon filter cigarette type was smoked and the smoke was analyzed for HCN content.
  • a control cigerette without an activated carbon filter and a cigarette containing the same activated carbon filter but without the cuprous chloride impregnant also was smoke and the smoke from these cigarettes was analyzed for HCN content using the same techniques.
  • Samples of the three test cigarettes were smoked on an automatic smoking apparatus.
  • the smoke was drawn by syringe from the cigarette through a glass fiber filter disc and through 75 ml. of 2 percent aqueous sodium hydroxide solution in a 100 ml. graduated cylinder.
  • the cylinder was fitted with a constricted tip, dip tube to provide good gas liquid contact.
  • a two second 40 mm. puff was taken at 58 second intervals.
  • smoking was stopped and the adsorbing solution was removed, diluted to 100 ml. with additional 2 percent sodium hydroxide, and an approximate aliquot taken for HNC analysis.
  • the cyanide content of the sodium hydroxide solutions obtained above was measured by a modification of the pyridine/pyrazolone procedure of Epstein (Analytical Chemistry, Vol. 19, No. 4, 272-4, 1947).
  • the method is a colorimetric procedure in which the cyanide is converted to cyanogen chloride with chloramine-T reagent (sodium p-toluene sulfonchloramide).
  • chloramine-T reagent sodium p-toluene sulfonchloramide
  • the cyanogen chloride reacts with pyridine to form glutaconic aldehyde which combines with l-phenyl-3- methyl-S-pyrazolone to form a blue colored complex.
  • the test procedure is described below.
  • the pH of the aliquot was adjusted to 7 with dilute acetic acid and transferred quantitatively to a 50 ml. volumetrical flask. A 0.2 ml. volume of 1 percent aqueous chloramine-T. was added. The solution was allowed to stand for 2 minutes and 5 ml. of pyridinepyrazolone solution was added. The contents of the flask were diluted to 50 ml. with distilled water and allowed to stand for 20 minutes for color development. Absorbance was measured using a Beckman DK-2 Spectrophotometer equipped with a lead sulfide detector. Distilled water was used as a reference. A graph of absorbance vs. hydrogen cyanide concentration was prepared using solutions of 2 percent aqueous sodium hydroxide containing known concentrations of potassium cyanide.
  • cuprous chloride inpregnated activated carbon filter was far superior to the filter containing no carbon and to the umimpregnated carbon filter delivering by far the lowest amount of HCN per cigarette to the smoke passed through the filter.
  • the activated carbon useful in preparing the tobacco smoke filter materials of this invention desirably are granular activated carbons having mesh sizes between 4 and 40 mesh (U.S. Sieve Series). Particularly desirable are activated carbons of 12 to 40 mesh. Such activated carbons can have widely varying surface areas. It has been found that activated carbon base materials can have surface areas between 250 m. /g. to 1200 mf/g. with no significant change in effectiveness. As noted above, the cuprous chloride impregnant is effective for HCN removal from tobacco smoke in the range of 0.5 to percent by weight of the activated carbon. Increases in the impregnant level does not proportionally increase the removal of HCN. Filter lengths between about 2 mm. and 6 mm. are effective with 4 to 6 mm. being preferred.
  • the tobacco smoke filter materials of this invention conveniently are prepared by soaking the activated carbon, either before or after screening to the desired mesh size, in an aqueous solution of cuprous chloride and ammonium hydroxide.
  • the activated carbon is allowed to remain in contact with the impregnating solution, either with or without stirring, until it has become thoroughly saturated. Usually about 1 to about 4 hours is satisfactory.
  • the wetted activated carbon is then separated from the impregnating solution and dried at about 100 to 150C to drive off excess water and ammonia and to deposit the cuprous chloride impregnant in the activated carbon. Such drying operation usually requires about 3 to 12 hours.
  • the amount of cuprous chloride in the impregnating solution is selected so as to afford the proportion of cuprous chloride which it is desired to deposit upon the activated carbon.
  • the method of removing HCN from tobacco smoke which comprises contacting said tobacco smoke with a tobacco smoke filtering material comprising at least about 50 milligrams of granular activated carbon impregnated with 0.5 to 15 percent by weight of cuprous chloride.
  • a smoking article having a burnable tobacco charge, a mouth end and a filter element interposed between said burnable tobacco charge and said mouth end, said filter elememt containing a tobacco smoke filtering material capable of removing HCN from tobacco smoke comprising at least about milligrams of granular activated carbon impregnated with 0.5 15

Abstract

An improved tobacco smoke filter material for removing HCN from tobacco smoke is provided which comprises activated carbon impregnated with an effective quantity of cuprous chloride.

Description

United States Patent Urbanic June 17, 1975 [54] TOBACCO SMOKE FILTER 3,426,763 2/1969 Sioan et a1. 131/266 3,460,543 8/1969 Keith et a1. 131/266 X [75] wanton Emery Urban, Plttsburgh, 3,724,469 4/1973 Reynolds et a1. 131/266 [73] Assignee: Calgon Corporation, Pittsburgh, Pa. Primary Examiner Me]vin Rein [22] Filed: Dec. 21, 1973 Attorney, Agent, or Firm-H. E. Westlake, Jr.; Frank h R F.
[21] App]. No.: 427,201 Ma aymond speer [52] US. Cl 131/267; 131/10.9 [57] ABSTRACT [51] Int. Cl A24b 15/02 58 Field of Search 131/10-10.9, An improved tobacco Smoke filter material for remov- 131/261-269, 17 ing HCN from tobacco smoke is provided which comprises activated carbon impregnated with an effective [56] References Ci d quantity of cuprous chloride.
UNITED STATES PATENTS 7/1962 Schur 131/10.9
5 Claims, No Drawings TOBACCO SMOKE FILTER This invention relates to a new tobacco smoke filter material useful for the removal of noxious and irritative material from tobacco smoke. More particularly, the instant invention is concerned with an improved tobacco smoke filter material comprising activated carbon impregnated with cuprous chloride; with methods for the preparation of such filter material; and with the use of such filter material for the removal of HCN from tobacco smoke.
As is well-known, constituents present in tobacco smoke formed during the act of smoking cigarettes, cigars, pipes and the like comprise combustion products derived from the tobacco and consist generally ofa gaseous phase in which is carried suspended liquid droplets and/or solid particles. Many of the chemical components of the gaseous phase and of the liquid droplets and solid particles are believed to be harmful to the health of the smoker and there have been proposed a variety of filtering elements to be used to clarify tobacco smoke and to remove from it components believed to be harmful.
Amoung the many materials proposed as cigarette filter materials are various cellulosic materials including cellulose, cellulose acetate, cotton, paper, starch, viscose rayon and the like. These materials have been fabricated into a variety of smoke-filtering elements designed for use with cigarettes, cigars and pipes either alone or in combination with a variety of adsorbants such as silica-gel, ion exchange resins, alumina, activated carbon and natural and synthetic clays. None of the commercially available filter materials, however, have proved entirely satisfactory.
Filter elements formed into cylinderical rings from cellulosic fibers have been found to be effective in removing from tobacco smoke a significant proportion of the liquid droplets and solid particles normally contained therein. Such filters, however, are relatively ineffective in removing gaseous components, and notably HCN, from tobacco smoke. Attempts to improve the gas adsorbing properties of such filters by incorporation therein of adsorbing materials such as those mentioned above, while showing some improvement, have been only partially effective in removing gaseous phase contaminants such as HCN due to a variety of factors including partial saturation or deactivation of adsorbant during manufacture of the filter element and in subsequent handling during the cigarette manufacturing process.
More recently, tobacco smoke filtering materials have been proposed which comprise gas adsorbant materials of high surface area such as activated charcoal, alumina, natural and synthetic clays and silica-gel which have been impregnated with a mixture of the oxides of iron and zinc. These tobacco smoke filtering materials have been found to be effective in the removal of gaseous contaminants including HCN from tobacco smoke (see Keith et al., US. Pat. No. 3,251365). The instant invention is concerned with applicants discovery that tobacco smoke filtering materials which are highly effective in removing HCN from tobacco smoke may be prepared by impregnating granular activated carbon with an effective quantity of cuprous chloride.
In its composition aspect, therefore, the instant invention may be described as residing in the concept of a tobacco smoke filtering material comprising graunlar activated carbon impregnated with cuprous chloride. It is contemplated that such tobacco smoke filtering material will be incorporated into cigarette filters or into cigarette and/or cigar holders or into pipe stem filter elements for the removal of HCN from tobacco smoke.
The instant invention is based upon applicants discovery that activated carbon containing from 0.5 to 15 per cent by weight is highly effective in removing HCN from tobacco smoke. This result has been confirmed by actual test employing standard laboratory techniques. A typical experiment is described below.
Activated carbon containing 2.0 per cent by weight cuprous chloride was prepared by the method hereinafter described and was loaded into mm standard cigarettes with 20 mm filter cavities between two cellulose acetate filter plugs. Approximately mg. of impregnated activated carbon was loaded into each cigarette to provide a filter length of about 4 mm. of carbon.
This carbon filter cigarette type was smoked and the smoke was analyzed for HCN content. A control cigerette without an activated carbon filter and a cigarette containing the same activated carbon filter but without the cuprous chloride impregnant also was smoke and the smoke from these cigarettes was analyzed for HCN content using the same techniques.
Samples of the three test cigarettes were smoked on an automatic smoking apparatus. The smoke was drawn by syringe from the cigarette through a glass fiber filter disc and through 75 ml. of 2 percent aqueous sodium hydroxide solution in a 100 ml. graduated cylinder. The cylinder was fitted with a constricted tip, dip tube to provide good gas liquid contact. A two second 40 mm. puff was taken at 58 second intervals. After the cigarette was smoked to a 35 mm. butt length, which usually required seven to nine puffs, smoking was stopped and the adsorbing solution was removed, diluted to 100 ml. with additional 2 percent sodium hydroxide, and an approximate aliquot taken for HNC analysis.
The cyanide content of the sodium hydroxide solutions obtained above was measured by a modification of the pyridine/pyrazolone procedure of Epstein (Analytical Chemistry, Vol. 19, No. 4, 272-4, 1947). The method is a colorimetric procedure in which the cyanide is converted to cyanogen chloride with chloramine-T reagent (sodium p-toluene sulfonchloramide). The cyanogen chloride reacts with pyridine to form glutaconic aldehyde which combines with l-phenyl-3- methyl-S-pyrazolone to form a blue colored complex. The test procedure is described below.
The pH of the aliquot was adjusted to 7 with dilute acetic acid and transferred quantitatively to a 50 ml. volumetrical flask. A 0.2 ml. volume of 1 percent aqueous chloramine-T. was added. The solution was allowed to stand for 2 minutes and 5 ml. of pyridinepyrazolone solution was added. The contents of the flask were diluted to 50 ml. with distilled water and allowed to stand for 20 minutes for color development. Absorbance was measured using a Beckman DK-2 Spectrophotometer equipped with a lead sulfide detector. Distilled water was used as a reference. A graph of absorbance vs. hydrogen cyanide concentration was prepared using solutions of 2 percent aqueous sodium hydroxide containing known concentrations of potassium cyanide.
The results obtained are shown below:
TABLE 1 C uC l lm pregnuted C arbon Delivered per Cigarette As confirmed above, the cuprous chloride inpregnated activated carbon filter was far superior to the filter containing no carbon and to the umimpregnated carbon filter delivering by far the lowest amount of HCN per cigarette to the smoke passed through the filter.
The activated carbon useful in preparing the tobacco smoke filter materials of this invention desirably are granular activated carbons having mesh sizes between 4 and 40 mesh (U.S. Sieve Series). Particularly desirable are activated carbons of 12 to 40 mesh. Such activated carbons can have widely varying surface areas. It has been found that activated carbon base materials can have surface areas between 250 m. /g. to 1200 mf/g. with no significant change in effectiveness. As noted above, the cuprous chloride impregnant is effective for HCN removal from tobacco smoke in the range of 0.5 to percent by weight of the activated carbon. Increases in the impregnant level does not proportionally increase the removal of HCN. Filter lengths between about 2 mm. and 6 mm. are effective with 4 to 6 mm. being preferred.
The tobacco smoke filter materials of this invention conveniently are prepared by soaking the activated carbon, either before or after screening to the desired mesh size, in an aqueous solution of cuprous chloride and ammonium hydroxide. The activated carbon is allowed to remain in contact with the impregnating solution, either with or without stirring, until it has become thoroughly saturated. Usually about 1 to about 4 hours is satisfactory. The wetted activated carbon is then separated from the impregnating solution and dried at about 100 to 150C to drive off excess water and ammonia and to deposit the cuprous chloride impregnant in the activated carbon. Such drying operation usually requires about 3 to 12 hours. The amount of cuprous chloride in the impregnating solution is selected so as to afford the proportion of cuprous chloride which it is desired to deposit upon the activated carbon.
In a typical preparation, 100 g. of 18 X 20 mesh activated carbon is deposited in a glass beaker. A solution of 2 g. of cupours chloride in 50 ml. of ammonium hydroxide is prepared and diluted to 100 ml. with distilled water. The weighed activated carbon is then stirred into the cuprous chloride solution and stirred occassionally for 3 hours. The wetted carbon is then separated from the impregnating solution and dried over night at 100C. The cuprous chloride impregnated carbon so produced then may be employed as the tobacco smoke filtering material in accordance with the instant invention.
The subject matter which applicant regards as his invention is particularly pointed out and distinctly claimed as follow:
1. The method of removing HCN from tobacco smoke which comprises contacting said tobacco smoke with a tobacco smoke filtering material comprising at least about 50 milligrams of granular activated carbon impregnated with 0.5 to 15 percent by weight of cuprous chloride. w
2. The method of claim 1 wherein said granular acti' vated carbon has a mesh size between 4 and 40 mesh and is impregnated with 0.5 to 15 percent by weight of cuprous chloride.
3. A smoking article having a burnable tobacco charge, a mouth end and a filter element interposed between said burnable tobacco charge and said mouth end, said filter elememt containing a tobacco smoke filtering material capable of removing HCN from tobacco smoke comprising at least about milligrams of granular activated carbon impregnated with 0.5 15
weight of cuprous chloride.

Claims (5)

1. THE METHOD OF REMOVING HCN FROM TOBACCO SMOKE WHICH COMPRISES CONTACTING SAID TOBACCO SMOKE WITH A TOBACCO SMOKE FILTERING MATERIAL COMPRISING AT LEAST ABOUT 50 MILLIGRAMS OF GRANULAR ACTIVATED CARBON IMPREGNATED WITH 0.5 TO 15 PERCENT BY WEIGHT OF CUPROUS CHLORIDE.
2. The method of claim 1 wherein said granular activated carbon has a mesh size between 4 and 40 mesh and is impregnated with 0.5 to 15 percent by weight of cuprous chloride.
3. A smoking article having a burnable tobacco charge, a mouth end and a filter element interposed between said burnable tobacco charge and said mouth end, said filter elememt containing a tobacco smoke filtering material capable of removing HCN from tobacco smoke comprising at least about 50 milligrams of granular activated carbon impregnated with 0.5 - 15 percent by weight of cuprous chloride.
4. The smoking article of claim 3 wherein said smoking article is a cigarette.
5. The smoking article of claim 4 wherein said granular activated carbon has a mesh size between 4 and 40 mesh and is impregnated with 0.5 to 15 percent by weight of cuprous chloride.
US427201A 1973-12-21 1973-12-21 Tobacco smoke filter Expired - Lifetime US3889691A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US427201A US3889691A (en) 1973-12-21 1973-12-21 Tobacco smoke filter
SE7415061A SE407508B (en) 1973-12-21 1974-12-02 ACTIVE CARBON FILTER FOR TOBACCO SMOKE, IMPREGNATED WITH COPPER CHLORIDE
CA215,643A CA1026184A (en) 1973-12-21 1974-12-10 Tobacco smoke filter
GB5431974A GB1458480A (en) 1973-12-21 1974-12-16 Tobacco
IT54572/74A IT1029636B (en) 1973-12-21 1974-12-16 TOBACCO SMOKE FILTER
FR7441820A FR2255021B1 (en) 1973-12-21 1974-12-18
BR10654/74A BR7410654D0 (en) 1973-12-21 1974-12-19 PERFECTED TOBACCO SMOKE FILTER PERFECTED PROCESS TO REMOVE HCN FROM TOBACCO SMOKE WELL AS A SMOKE ARTICLE
DE2460650A DE2460650C3 (en) 1973-12-21 1974-12-20 Tobacco smoke filter material
CH1715474A CH583530A5 (en) 1973-12-21 1974-12-20
JP49147499A JPS5134919B2 (en) 1973-12-21 1974-12-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US427201A US3889691A (en) 1973-12-21 1973-12-21 Tobacco smoke filter

Publications (1)

Publication Number Publication Date
US3889691A true US3889691A (en) 1975-06-17

Family

ID=23693891

Family Applications (1)

Application Number Title Priority Date Filing Date
US427201A Expired - Lifetime US3889691A (en) 1973-12-21 1973-12-21 Tobacco smoke filter

Country Status (10)

Country Link
US (1) US3889691A (en)
JP (1) JPS5134919B2 (en)
BR (1) BR7410654D0 (en)
CA (1) CA1026184A (en)
CH (1) CH583530A5 (en)
DE (1) DE2460650C3 (en)
FR (1) FR2255021B1 (en)
GB (1) GB1458480A (en)
IT (1) IT1029636B (en)
SE (1) SE407508B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246910A (en) * 1977-08-01 1981-01-27 Philip Morris Incorporated Cigarette filter material comprising compounds of iron in high oxidation states
WO2003071886A1 (en) * 2002-02-22 2003-09-04 Philip Morris Products S.A. Flavored carbon useful as filtering material of smoking article
US20040107973A1 (en) * 2002-12-09 2004-06-10 Atwell Charles Gary Foam injection device and method of filling cavities
US20060086366A1 (en) * 2004-10-25 2006-04-27 Philip Morris Usa Inc. Surface modified adsorbents and use thereof
US20070295346A1 (en) * 2003-10-20 2007-12-27 Mccormack Anthony Tobacco Smoke Filter

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6038045Y2 (en) * 1976-10-16 1985-11-13 ヤンマーディーゼル株式会社 C・D・I device and fuel cock mounting device for spark ignition internal combustion engine
JPH0620294U (en) * 1992-04-21 1994-03-15 スエ 栗本 Bouquet bag for bouquets
GB201112539D0 (en) 2011-07-21 2011-08-31 British American Tobacco Co Porous carbon and methods of production thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046994A (en) * 1959-07-02 1962-07-31 Olin Mathieson Ventilated cigarette
US3426763A (en) * 1965-07-21 1969-02-11 Eastman Kodak Co Tobacco smoke filter having a coated carbon additive
US3460543A (en) * 1966-03-21 1969-08-12 Liggett & Myers Inc Cigarette filter
US3724469A (en) * 1971-09-23 1973-04-03 Eastman Kodak Co Tobacco smoke filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046994A (en) * 1959-07-02 1962-07-31 Olin Mathieson Ventilated cigarette
US3426763A (en) * 1965-07-21 1969-02-11 Eastman Kodak Co Tobacco smoke filter having a coated carbon additive
US3460543A (en) * 1966-03-21 1969-08-12 Liggett & Myers Inc Cigarette filter
US3724469A (en) * 1971-09-23 1973-04-03 Eastman Kodak Co Tobacco smoke filter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246910A (en) * 1977-08-01 1981-01-27 Philip Morris Incorporated Cigarette filter material comprising compounds of iron in high oxidation states
WO2003071886A1 (en) * 2002-02-22 2003-09-04 Philip Morris Products S.A. Flavored carbon useful as filtering material of smoking article
US20040226569A1 (en) * 2002-02-22 2004-11-18 Philip Morris Incorporated Flavored carbon useful as filtering material of smoking article
US20040107973A1 (en) * 2002-12-09 2004-06-10 Atwell Charles Gary Foam injection device and method of filling cavities
US20070295346A1 (en) * 2003-10-20 2007-12-27 Mccormack Anthony Tobacco Smoke Filter
US20060086366A1 (en) * 2004-10-25 2006-04-27 Philip Morris Usa Inc. Surface modified adsorbents and use thereof
US7832412B2 (en) * 2004-10-25 2010-11-16 Phillip Morris Usa Inc. Surface modified adsorbents and use thereof

Also Published As

Publication number Publication date
CA1026184A (en) 1978-02-14
JPS5134919B2 (en) 1976-09-29
CH583530A5 (en) 1977-01-14
JPS5095500A (en) 1975-07-29
SE7415061L (en) 1975-06-23
DE2460650B2 (en) 1979-08-30
IT1029636B (en) 1979-03-20
FR2255021A1 (en) 1975-07-18
DE2460650A1 (en) 1975-06-26
DE2460650C3 (en) 1980-05-08
FR2255021B1 (en) 1977-11-10
SE407508B (en) 1979-04-02
BR7410654D0 (en) 1975-09-02
GB1458480A (en) 1976-12-15

Similar Documents

Publication Publication Date Title
US3236244A (en) Tobacco smoke filter element
FI61614B (en) TILLSATSAEMNE FOER ROEKTOBAKSPRODUKTER OCH DERAS FILTERELEMENT
US3584630A (en) Tobacco product having low nicotine content associated with a release agent having nicotine weakly absorbed thereon
US3434479A (en) Permanganate tobacco smoke filter
RU2010545C1 (en) Cigarette filter
KR900015652A (en) High efficiency cigarette smoke filter
US4266561A (en) Tobacco smoke filtering compositions
US3889691A (en) Tobacco smoke filter
USRE31700E (en) Cigarette filter
US3875949A (en) Tobacco smoke filter
US4517995A (en) Filters for polynuclear aromatic hydrocarbon-containing smoke
US3802441A (en) Tobacco smoke filter additive
US3550600A (en) Cigarette filters
CN209284314U (en) A kind of binary compound filter candle reducing CO in cigarette mainstream flue gas
JP2007508818A (en) Cigarette smoke filter
US3426763A (en) Tobacco smoke filter having a coated carbon additive
US3349779A (en) Cigarette filter element containing certain hexahydrotriazines for the selective removal of acrolein
US2818073A (en) Tobacco smoke filtering material
US2920416A (en) Treatment of tobacco smoke
US5115824A (en) Filtration of tobacco using moisture free, electrically neutral hydrophobic particles
EP0493026A2 (en) Cigarette filter
US2920630A (en) Tobacco smoke filter
RU2045921C1 (en) Cigarette filter
US3390688A (en) Filter for removing oxides of nitrogen from tobacco smoke
US2920629A (en) Filtration of tobacco smoke

Legal Events

Date Code Title Description
AS Assignment

Owner name: CALGON CARBON CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:CALGON CORPORATION;REEL/FRAME:004345/0918

Effective date: 19820624

AS Assignment

Owner name: BANKERS TRUST COMPANY

Free format text: SECURITY INTEREST;ASSIGNOR:CALGON CARBON CORPORATION;REEL/FRAME:004398/0398

Effective date: 19850419

AS Assignment

Owner name: CALGON CARBON CORPORATION

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BANKERS TRUST COMPANY;REEL/FRAME:005017/0627

Effective date: 19880901