GB655274A - Improvements in processes of photographic reproduction - Google Patents
Improvements in processes of photographic reproductionInfo
- Publication number
- GB655274A GB655274A GB10545/48A GB1054548A GB655274A GB 655274 A GB655274 A GB 655274A GB 10545/48 A GB10545/48 A GB 10545/48A GB 1054548 A GB1054548 A GB 1054548A GB 655274 A GB655274 A GB 655274A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emulsion
- support
- developing agent
- image
- layer
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/06—Silver salts
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/29—Development processes or agents therefor
- G03C5/315—Tanning development
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S101/00—Printing
- Y10S101/29—Printing involving a color-forming phenomenon
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Paper (AREA)
- Laminated Bodies (AREA)
- Printing Plates And Materials Therefor (AREA)
Abstract
655,274. Photographic processes. KODAK, Ltd. (Eastman Kodak Co., Yutzy, H. C., and Yackel, E. C.). April 15, 1948, No. 10545. [Class 98 (ii)] A method of photographic reproduction comprises exposing to an object or image a substantially unhardened light-sensitive silver salt emulsion layer, developing the exposed layer in the presence of a tanning, developing agent, and transferring in the presence of moisture at least a thin stratum of the unexposed and unhardened parts of the emulsion layer to a support, which may be absorbent. The emulsion binder may be gelatin, polyvinyl alcohol, a hydrolysed cellulose ester, or an imagewise hardenable resin (e.g. polyacrylamide) and may contain a pigment, e.g. metallic silver, carbon black, or Monastral Fast Blue BWD. The tanning developing agent may be incorporated in the emulsion layer as in Specification 655,273, and development effected by means of an alkaline solution. Alternatively, the exposed material may be treated with a solution of a tanning developing agent and then with an alkaline solution, or the exposed material may be treated with the solution of a tanning developing agent and then placed in contact with the receiving support with a layer of alkaline solution between. The absorbent support may be paper, wood, or cloth, and after contacting the moist emulsion layer with such support, an outer thin stratum of the unexposed and unhardened portion of the emulsion layer is caused to adhere thereto by the application of pressure, and, if necessary, heat. After stripping, the differentially hardened layer may be rewetted with the alkaline solution and additional transfers similarly made. The optical density of the transferred image may be increased by treatment with a sulphide (e.g. sodium or zinc sulphide), alkaline thiourea, or a metal salt, or the transferred image may be further exposed and, if desired, heated and treated with a reducing agent or developed in an alkaline solution which may contain a developing agent. If the layer contained a developing agent before exposure, the density may be increased by exposing and heating the print. The transferred image may be colour developed, or a coupling component, with or without a colour developing agent of lower developing rate than the tanning developing agent, may be incorporated in the emulsion. The receiving support may be coated with a sulphide or thiourea, with alkali, with citric acid to facilitate stripping from the receiving support, and with sulphite, bisulphite, or ascorbic acid. The colloidal binder of the transferred image may be hardened with alum or chromium salts. Development may be commenced by treating with ammonia solution or by fuming with ammonia. The preparation of a gelatino silver chloride emulsion containing as a tanning developing agent 3 : 4-dihydroxydiphenyl, and slightly hardened with formaldehyde, is described. In an example, the emulsion is exposed by contact or projection printing, is treated in a sodium carbonate bath and excess alkaline solution removed by squeegeeing, and a sheet of paper is rolled into contact with the emulsion and immediately removed. On exposure to light, the transferred image develops to a positive image, development being accelerated by heat. Further transfers may be effected by re-wetting the negative with alkaline solution, squeegeeing off excess, and rolling into contact with paper. Six to eight copies may be made. With an emulsion not containing a developing agent, the exposed material is immersed in aqueous hydroquinone solution prior to treatment in the sodium carbonate solution, which includes a small amount of sulphite. A diazo compound and/or an azo coupling component may be incorporated in the emulsion, the remaining component (if any) being incorporated in the receiving support. An azo dye image is formed in the transferred area. The negative image remaining on the support may be treated with a reducing agent (sodium sulphite) and then squeezed into contact with a support carrying a layer of dye bleachable with sulphite (e.g. Malachite Green) to give a direct positive image of the original subject in dye. An ink or pigment may be rolled into the matrix remaining after transfer of the soft unhardened emulsion, and the ink or pigment transferred on to a support. With a gelatin emulsion, the developing solution may contain formamide, ethylene chlorhydrin, urea, sodium nitrate, or glycerol to facilitate transfer. A stencil may be prepared by coating the emulsion on a porous support such as cloth, silk, or highly porous paper and transfer the unhardened image after exposure or processing in one or more transfers until the support becomes pervious to a printing ink in the unhardened area. By the selection or preparation of an emulsion layer of suitable softness or thickness, or a suitable temperature or pressure during transfer, substantially all of the unhardened gelatin may be transferred in one operation. Specification 655,275 also is referred to,
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US783914A US2596756A (en) | 1947-11-04 | 1947-11-04 | Photomechanical copy method |
US267482A US2763553A (en) | 1947-11-04 | 1952-01-21 | Lithographic offset printing process |
US267446A US2675313A (en) | 1947-11-04 | 1952-01-21 | Photographic reproduction process |
Publications (1)
Publication Number | Publication Date |
---|---|
GB655274A true GB655274A (en) | 1951-07-18 |
Family
ID=27401969
Family Applications (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10545/48A Expired GB655274A (en) | 1947-11-04 | 1948-04-15 | Improvements in processes of photographic reproduction |
GB10544/48A Expired GB655273A (en) | 1947-11-04 | 1948-04-15 | Improved photographic materials |
GB1826/53A Expired GB725667A (en) | 1947-11-04 | 1953-01-21 | Improvements in processes of photographic reproduction |
GB1827/53A Expired GB726543A (en) | 1947-11-04 | 1953-01-21 | Improvements in processes of photographic reproduction |
Family Applications After (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB10544/48A Expired GB655273A (en) | 1947-11-04 | 1948-04-15 | Improved photographic materials |
GB1826/53A Expired GB725667A (en) | 1947-11-04 | 1953-01-21 | Improvements in processes of photographic reproduction |
GB1827/53A Expired GB726543A (en) | 1947-11-04 | 1953-01-21 | Improvements in processes of photographic reproduction |
Country Status (5)
Country | Link |
---|---|
US (4) | US2596756A (en) |
BE (4) | BE485609A (en) |
DE (2) | DE874704C (en) |
FR (4) | FR980399A (en) |
GB (4) | GB655274A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1200134B (en) * | 1957-05-09 | 1965-09-02 | Wilhelm Ritzerfeld | Printing form foil with a light-sensitive direct positive halogen silver layer and a translucent carrier |
DE1256541B (en) * | 1963-01-23 | 1967-12-14 | Eastman Kodak Co | Copier with a developing device for matrices with a grip edge |
Families Citing this family (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE485609A (en) * | 1947-11-04 | 1942-11-12 | ||
BE517065A (en) * | 1952-01-21 | |||
US2739890A (en) * | 1952-01-21 | 1956-03-27 | Eastman Kodak Co | Photographic reproduction process |
BE519520A (en) * | 1952-05-03 | |||
BE538152A (en) * | 1952-05-03 | |||
NL178293B (en) * | 1952-05-13 | Shell Int Research | COLUMN FOR BRINGING LIQUID AND VAPOR INTO CONTACT WITH EACH OTHER. | |
US2710820A (en) * | 1952-09-18 | 1955-06-14 | Eastman Kodak Co | Formation of laminates using contact resins |
US2704712A (en) * | 1952-09-18 | 1955-03-22 | Eastman Kodak Co | Photographic copying process |
US2795504A (en) * | 1952-10-25 | 1957-06-11 | Dick Co Ab | Compositions for use in the manufacture of elements in reproduction |
US3010389A (en) * | 1953-03-09 | 1961-11-28 | Buskes Willem Marie | Photographic transfer printing plates |
US2747999A (en) * | 1953-03-16 | 1956-05-29 | Eastman Kodak Co | Photographic reproduction process |
DE954391C (en) * | 1953-06-05 | 1956-12-13 | Agfa Ag Fuer Photofabrikation | Halogen silver layers containing developer substances |
US2969015A (en) * | 1953-07-14 | 1961-01-24 | Dick Co Ab | Method of producing a spirit master from a positive and a duplicating process with same |
US2914404A (en) * | 1953-07-31 | 1959-11-24 | Blaupunkt Werke Gmbh | Method of producing two-dimensional circuits or circuit elements on supporting bases |
US2756143A (en) * | 1953-12-24 | 1956-07-24 | Eastman Kodak Co | Photographic reproduction process |
US3010390A (en) * | 1954-06-29 | 1961-11-28 | Buskes Willem Marie | Planographic printing plates |
US3010391A (en) * | 1954-06-29 | 1961-11-28 | Grinten Chem L V D | Light-sensitive sheets and process for producing transfer images |
US2903964A (en) * | 1955-01-24 | 1959-09-15 | Eastman Kodak Co | Photographic spirit duplicating process |
US3029727A (en) * | 1956-07-13 | 1962-04-17 | Polychrome Corp | Method and composition for fixing transfer image |
US3278958A (en) * | 1955-03-31 | 1966-10-18 | Dick Co Ab | Method of imaging a photolithographic plate and elements for use in the preparation of same |
BE546664A (en) * | 1955-04-05 | |||
US2942975A (en) * | 1955-05-05 | 1960-06-28 | Keuffel & Esser Co | Photosensitive material |
US2873671A (en) * | 1955-05-11 | 1959-02-17 | Dick Co Ab | Copy process and materials for use in same |
US2834676A (en) * | 1955-07-19 | 1958-05-13 | Sperry Rand Corp | Photographic diffusion transfer process for producing multiple direct positive copies |
US3220837A (en) * | 1955-07-22 | 1965-11-30 | Polaroid Corp | Diffusion transfer to stratum of a silver image inked and used in printing |
US2865745A (en) * | 1955-08-25 | 1958-12-23 | Eastman Kodak Co | Photographic reproduction process |
BE555103A (en) * | 1956-02-18 | |||
BE555263A (en) * | 1956-02-25 | |||
US2856283A (en) * | 1956-05-07 | 1958-10-14 | Eastman Kodak Co | Photographic emulsion |
US3091528A (en) * | 1958-08-19 | 1963-05-28 | Chem Fab L Van Der Grinten N V | Process and light-sensitive sheets for the production of pigment images by transfer |
US3091529A (en) * | 1958-08-19 | 1963-05-28 | Chem Fab L Van Der Grinton N V | Process and light-sensitive screen-sheets for the production of pigment images by transfer |
BE628533A (en) * | 1959-04-10 | |||
BE590925A (en) * | 1959-05-20 | |||
US3060022A (en) * | 1959-07-13 | 1962-10-23 | Gen Aniline & Film Corp | Image transfer process |
US3146104A (en) * | 1959-12-21 | 1964-08-25 | Eastman Kodak Co | Silver halide sensitized lithographic printing plate |
US3106517A (en) * | 1960-07-28 | 1963-10-08 | Eastman Kodak Co | Photoconductography employing spongy images containing gelatin hardeners |
US3106516A (en) * | 1960-07-28 | 1963-10-08 | Eastman Kodak Co | Photoconductography employing electrolytic images to harden or soften films |
US3152969A (en) * | 1960-07-28 | 1964-10-13 | Eastman Kodak Co | Photoconductolithography employing hydrophobic images |
US3295969A (en) * | 1961-04-12 | 1967-01-03 | Eastman Kodak Co | Photographic spirit duplicating process |
FR1333745A (en) * | 1962-03-14 | 1963-08-02 | Kodak Pathe | New photothermographic product and method of photographic reproduction using such product |
BE636329A (en) * | 1962-08-20 | |||
US3189448A (en) * | 1962-08-22 | 1965-06-15 | Eastman Kodak Co | Developing compositions used in photographic transfer processes |
US3189449A (en) * | 1962-10-01 | 1965-06-15 | Eastman Kodak Co | Colloid stratum transfer process |
US3240600A (en) * | 1963-01-16 | 1966-03-15 | Eastman Kodak Co | Colloid transfer process |
GB1053631A (en) * | 1963-01-16 | |||
US3345170A (en) * | 1964-06-05 | 1967-10-03 | Eastman Kodak Co | Light sensitive photographic elements containing developing agent precursors |
US3326687A (en) * | 1964-11-10 | 1967-06-20 | Eastman Kodak Co | Photographic colloid transfer system |
US3751161A (en) * | 1965-10-01 | 1973-08-07 | Itek Corp | Photographic image transfer apparatus |
US3650742A (en) * | 1968-07-01 | 1972-03-21 | Eastman Kodak Co | Oleophilizing gelatinous images |
JPS5619277B2 (en) * | 1973-10-03 | 1981-05-06 | ||
DE2832530C2 (en) * | 1978-07-25 | 1984-08-02 | Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf | Photosensitive material for tanning development |
JPS6015262B2 (en) * | 1979-02-26 | 1985-04-18 | 富士写真フイルム株式会社 | Silver halide photographic material |
JPS5625729A (en) * | 1979-08-07 | 1981-03-12 | Fuji Photo Film Co Ltd | Silver halide photographic material |
JPS59188641A (en) | 1983-04-11 | 1984-10-26 | Fuji Photo Film Co Ltd | Silver halide photographic emulsion |
US5037734A (en) * | 1989-12-28 | 1991-08-06 | Eastman Kodak Company | Stabilized photographic element containing infrared sensitizing dye |
JP2739261B2 (en) * | 1991-05-07 | 1998-04-15 | 富士写真フイルム株式会社 | Image forming method |
Family Cites Families (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US116720A (en) * | 1871-07-04 | Improvement in producing colored prints on paper and other fabrics | ||
USRE20694E (en) * | 1938-04-12 | Method of making covering material | ||
US663539A (en) * | 1900-06-01 | 1900-12-11 | Carl Giesecke | Process of producing transfers. |
US742405A (en) * | 1901-12-17 | 1903-10-27 | Farbenfabriken Elberfeld Co | Photographic plate and process of making same. |
US1118479A (en) * | 1912-04-01 | 1914-11-24 | Ozias Dodge | Process of producing printing-surfaces. |
US1102028A (en) * | 1913-01-27 | 1914-06-30 | Rudolf Fischer | Process of making colored photographs. |
DE334277C (en) * | 1918-11-20 | 1921-03-14 | Jens Herman Christensen | Process for curing photographic skin |
DE347748C (en) * | 1920-09-03 | 1922-01-24 | Heinrich Renck | Process for the production of gelatin printing plates |
GB204101A (en) * | 1922-06-17 | 1923-09-17 | Mimosa Ag | Improved process for photographically copying line drawings, letterpress and the like |
US1618505A (en) * | 1922-09-07 | 1927-02-22 | Wadsworth Watch Case Co | Offset litho process |
US1535700A (en) * | 1922-09-13 | 1925-04-28 | Kalmus Comstock & Wescott Inc | Selective photographic hardening |
GB226598A (en) * | 1923-10-29 | 1924-12-22 | Polygraphische Ges | Improvements in and relating to the production of photomechanical printing surfaces |
FR580820A (en) * | 1924-03-27 | 1924-11-17 | Anilin Fabrikation Ag | Manufacturing process of collotype plates |
FR589422A (en) * | 1924-11-19 | 1925-05-28 | Gelatin insolubilization process, its applications and resulting products | |
GB262531A (en) * | 1925-09-15 | 1926-12-15 | Eustace Bernard Eldridge | Improvements in or relating to photo mechanical processes of printing |
FR622688A (en) * | 1926-02-08 | 1927-06-03 | Photochimie Elka Soc D | Improvements to gelatin silver bromide image transfer processes and their applications |
US1957850A (en) * | 1926-11-22 | 1934-05-08 | Richards Thomas Ernest | Printing plate and method of making the same |
GB324330A (en) * | 1928-09-11 | 1930-01-13 | Nicolas Pozniakov | Photographic paper having a transferable gelatine-silver film, and processes in connection therewith |
US1944123A (en) * | 1930-09-04 | 1934-01-16 | Gardner Abbott | Photogelatin printing |
US2058396A (en) * | 1933-03-13 | 1936-10-27 | Elton N Baker | Photoink printing |
US2039730A (en) * | 1935-02-27 | 1936-05-05 | Eastman Kodak Co | Color-forming developer |
DE691344C (en) * | 1935-06-13 | 1940-05-23 | Nl Lab De Spaarnestad Haarlem | Developer to achieve hardening images |
US2090484A (en) * | 1936-01-27 | 1937-08-17 | Iwan I Ostromislensky | Stabilized hydrocarbons |
US2184310A (en) * | 1937-06-10 | 1939-12-26 | Du Pont | Photographic and printing media |
US2214565A (en) * | 1938-01-26 | 1940-09-10 | Champion Paper & Fibre Co | Coated paper and method of making the same |
US2315966A (en) * | 1940-04-15 | 1943-04-06 | Eastman Kodak Co | Photographic emulsion |
FR956671A (en) * | 1941-07-10 | 1950-02-02 | ||
US2534650A (en) * | 1947-05-09 | 1950-12-19 | Warren S D Co | Planographic printing plate and method of making same |
US2350124A (en) * | 1942-07-30 | 1944-05-30 | Eastman Kodak Co | Photographic tracing cloth |
US2367939A (en) * | 1943-02-05 | 1945-01-23 | Westinghouse Electric & Mfg Co | Process for producing name plates and the like |
US2409959A (en) * | 1944-05-17 | 1946-10-22 | Polaroid Corp | Method of forming images of dichroic materials |
FR955703A (en) * | 1944-07-28 | 1950-01-19 | ||
BE485609A (en) * | 1947-11-04 | 1942-11-12 | ||
US2484431A (en) * | 1948-07-17 | 1949-10-11 | Eastman Kodak Co | Method of making hydrolyzed cellulose acetate printing plates |
US2568503A (en) * | 1949-02-09 | 1951-09-18 | Eastman Kodak Co | Cellulose ester lithographic printing process |
US2549177A (en) * | 1949-03-21 | 1951-04-17 | Strathmore Paper Company | Sized paper, composition therefor, and method of making same |
BE517065A (en) * | 1952-01-21 |
-
1942
- 1942-10-30 BE BE485609D patent/BE485609A/xx unknown
-
1947
- 1947-11-04 US US783914A patent/US2596756A/en not_active Expired - Lifetime
- 1947-11-04 US US783912A patent/US2592368A/en not_active Expired - Lifetime
-
1948
- 1948-04-15 GB GB10545/48A patent/GB655274A/en not_active Expired
- 1948-04-15 GB GB10544/48A patent/GB655273A/en not_active Expired
- 1948-10-30 BE BE485611D patent/BE485611A/xx unknown
- 1948-11-03 FR FR980399D patent/FR980399A/en not_active Expired
- 1948-11-03 FR FR980401D patent/FR980401A/en not_active Expired
-
1950
- 1950-09-17 DE DEE2141A patent/DE874704C/en not_active Expired
-
1952
- 1952-01-21 US US267482A patent/US2763553A/en not_active Expired - Lifetime
- 1952-01-21 US US267446A patent/US2675313A/en not_active Expired - Lifetime
-
1953
- 1953-01-20 DE DEE6633A patent/DE927307C/en not_active Expired
- 1953-01-21 FR FR1089934D patent/FR1089934A/en not_active Expired
- 1953-01-21 FR FR1092963D patent/FR1092963A/en not_active Expired
- 1953-01-21 GB GB1826/53A patent/GB725667A/en not_active Expired
- 1953-01-21 GB GB1827/53A patent/GB726543A/en not_active Expired
- 1953-01-21 BE BE517066D patent/BE517066A/xx unknown
- 1953-02-21 BE BE517064D patent/BE517064A/xx unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1200134B (en) * | 1957-05-09 | 1965-09-02 | Wilhelm Ritzerfeld | Printing form foil with a light-sensitive direct positive halogen silver layer and a translucent carrier |
DE1256541B (en) * | 1963-01-23 | 1967-12-14 | Eastman Kodak Co | Copier with a developing device for matrices with a grip edge |
Also Published As
Publication number | Publication date |
---|---|
DE927307C (en) | 1955-05-23 |
BE517064A (en) | 1954-11-26 |
US2675313A (en) | 1954-04-13 |
GB655273A (en) | 1951-07-18 |
DE874704C (en) | 1953-04-27 |
FR980399A (en) | 1951-05-11 |
FR1089934A (en) | 1955-03-24 |
BE485609A (en) | 1942-11-12 |
FR980401A (en) | 1951-05-11 |
FR1092963A (en) | 1955-04-28 |
BE517066A (en) | 1954-11-26 |
BE485611A (en) | 1948-11-13 |
GB725667A (en) | 1955-03-09 |
US2592368A (en) | 1952-04-08 |
US2596756A (en) | 1952-05-13 |
GB726543A (en) | 1955-03-23 |
US2763553A (en) | 1956-09-18 |
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