US1663959A - Preparation of photographic developers - Google Patents
Preparation of photographic developers Download PDFInfo
- Publication number
- US1663959A US1663959A US26804A US2680425A US1663959A US 1663959 A US1663959 A US 1663959A US 26804 A US26804 A US 26804A US 2680425 A US2680425 A US 2680425A US 1663959 A US1663959 A US 1663959A
- Authority
- US
- United States
- Prior art keywords
- developer
- preparation
- hydroxylamine
- photographic
- photographic developers
- 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
Links
Classifications
-
- 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
- G03C5/30—Developers
- G03C5/3014—Hydrazine; Hydroxylamine; Urea; Derivatives thereof
Definitions
- Nitrilosulphonic acid N SO3H
- Derivatives of hydroxylamine can also be used in which one atom of hydrogen is re- .placed by an organic-radical of thetype C.H -C H etc., such as H 1) RN/ on. v 1
- a developer for photographic pur; is replaced by an organic radical of the type poses, formed by mixing with substances CH -C H constituting an ordinary developer, hy- In witness whereof I aflix my signature. droxylamine derivatives obtained by replacing the hydrogen atoms of hydroxylam- PIERRE SOHESTAKOFF.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
Patented Mar. 27, 1928. I
PATENT OF F ICE."
PIERRE SCHESTAKOFF, OF PARIS, FRANCE.
PREPARATION F PHOTOGRAPHIC DEVELOPERS.
No Drawing. Application filed April-29, 1925, Serial No. 26,804, and in Germany May 12, 1 924.
In the present state of the art there is no method known in photography for obtaining automatic rectification of errors 1n exposure.
The processes utilized up,v to the present for efiecting such rectifications consist simply in modifications in the composition or concentration of the developers being used, during development, the result being that these rectifications depend merely upon the experience and skill of the operator. In
many cases, as for instance during the development of a film in which normally exposed, over exposed and under exposed portions are all present without it being known in which portions of the filmthe defective sections are to be found, rectifications are impossible. 0'
When using ordinary plates in the case of which there are greatly over exposed or under exposed portions or which have been exposed to a bright facing light, there is no process which enables a good negative to be obtained, that is to say a negative which is not clouded, fogged by the sun or showing cals as for instance H Hydroxylamine sulphonic acid N OH SOaH.
Hydroxylamine disulphonic acid N-SO3H SOzH.
. I v Hydroxylamine isodisulphonic acid N-OSOaH SOaH.
SOaH Hydroxylamine trisulphonic acid N-OSOzH SOaH.
Nitrilosulphonic acid N (SO3H) Derivatives of hydroxylamine can also be used in which one atom of hydrogen is re- .placed by an organic-radical of thetype C.H -C H etc., such as H 1) RN/ on. v 1
, our
osom.
. so 11 4 R=I-{ a I so|n. Finally derivatives of hydroxylamine may 'be employed in which the hydrogen, atom is replaced by an organic radical of the type C H CO, such as hydroxamic acid for instance v v Each of these substances or their salts when introduced into the composition of the developer gives it new properties by means of which, during development, without modifying the composition or concentration, defects of exposure may be suppressed as also the phenomena of fogging and halo when exposures are taken facing a bright light. In general the violent contrasts between light and shade are equalized. At the same time the said substances reduce to so great an extent the sensitivity of the silver haloids that it is possible to develop in a bright red light or even in a yellow light.
By way of example, the following composition of a developer made according to the invention is now given.
Grammes. Water 1,000 Hydroquinone- 5 Sodium sulfite 20 Sodium hydroxylamine isodisulphonate 5 40 Sodium carbonate Potassium bromid 1 What I claim and desire to secure by Letters Patent of the Un ted States of America 1. A photographic developer formed by mixing with substances constituting an ord1- nary developer, nitrous acid salts and sulphurous acid salts, substantlally as described.
2. A photographic developer formed by ine by sulphonicradicals, substantially as mixing with substances constltuting an ordidescribed. nary developer, the reaction products of 4. A developer for photographic purposes, nitrous acid salts with sulphurous acid salts formed by mixing with substances-'constiimt- 15 substantially as and for the purposes deing-Ian ordinary developer,hydroxylamine scribed. derivatives in which one atom of hydrogen 3. A developer for photographic pur; is replaced by an organic radical of the type poses, formed by mixing with substances CH -C H constituting an ordinary developer, hy- In witness whereof I aflix my signature. droxylamine derivatives obtained by replacing the hydrogen atoms of hydroxylam- PIERRE SOHESTAKOFF.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA258966T | |||
DE1663959X | 1924-05-12 | ||
GB10756/25A GB255925A (en) | 1924-05-12 | 1925-04-24 | Improvements in and relating to the preparation of photographic developers |
Publications (1)
Publication Number | Publication Date |
---|---|
US1663959A true US1663959A (en) | 1928-03-27 |
Family
ID=50069349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US26804A Expired - Lifetime US1663959A (en) | 1924-05-12 | 1925-04-29 | Preparation of photographic developers |
Country Status (4)
Country | Link |
---|---|
US (1) | US1663959A (en) |
CA (1) | CA258966A (en) |
FR (1) | FR600532A (en) |
GB (1) | GB255925A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706157A (en) * | 1951-07-21 | 1955-04-12 | Grant Photo Products Inc | Processing photographic paper and film |
US2938793A (en) * | 1957-12-23 | 1960-05-31 | Technical Operations Inc | Nitrosodisulfonate latensifier |
US3751252A (en) * | 1972-03-24 | 1973-08-07 | Eastman Kodak Co | Photothermographic element and process |
US4055426A (en) * | 1975-08-27 | 1977-10-25 | Fuji Photo Film Co., Ltd. | Process for stabilizing a color developing solution |
US4299913A (en) * | 1977-10-01 | 1981-11-10 | Agfa-Gevaert Ag | Photographic reversal process without second exposure |
US4699868A (en) * | 1984-03-02 | 1987-10-13 | Minnesota Mining And Manufacturing Company | Photographic tanning developer formulation |
US5508155A (en) * | 1994-12-22 | 1996-04-16 | Eastman Kodak Company | Photographic color developers containing odorless antioxidants formed in situ from reaction of hydroxylamine and epoxide and use of same |
EP0710876A1 (en) | 1994-11-02 | 1996-05-08 | Minnesota Mining And Manufacturing Company | Black and white photographic elements |
-
0
- CA CA258966A patent/CA258966A/en not_active Expired
-
1925
- 1925-04-21 FR FR600532D patent/FR600532A/en not_active Expired
- 1925-04-24 GB GB10756/25A patent/GB255925A/en not_active Expired
- 1925-04-29 US US26804A patent/US1663959A/en not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2706157A (en) * | 1951-07-21 | 1955-04-12 | Grant Photo Products Inc | Processing photographic paper and film |
US2938793A (en) * | 1957-12-23 | 1960-05-31 | Technical Operations Inc | Nitrosodisulfonate latensifier |
US3751252A (en) * | 1972-03-24 | 1973-08-07 | Eastman Kodak Co | Photothermographic element and process |
US4055426A (en) * | 1975-08-27 | 1977-10-25 | Fuji Photo Film Co., Ltd. | Process for stabilizing a color developing solution |
US4299913A (en) * | 1977-10-01 | 1981-11-10 | Agfa-Gevaert Ag | Photographic reversal process without second exposure |
US4699868A (en) * | 1984-03-02 | 1987-10-13 | Minnesota Mining And Manufacturing Company | Photographic tanning developer formulation |
EP0710876A1 (en) | 1994-11-02 | 1996-05-08 | Minnesota Mining And Manufacturing Company | Black and white photographic elements |
US5508155A (en) * | 1994-12-22 | 1996-04-16 | Eastman Kodak Company | Photographic color developers containing odorless antioxidants formed in situ from reaction of hydroxylamine and epoxide and use of same |
US5620835A (en) * | 1994-12-22 | 1997-04-15 | Eastman Kodak Company | Method for preparing photographic color developer and reaction mixture useful in same |
Also Published As
Publication number | Publication date |
---|---|
FR600532A (en) | 1926-02-09 |
CA258966A (en) | 1926-03-16 |
GB255925A (en) | 1926-07-26 |
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