US2192891A - Photographic developer and process of development - Google Patents

Photographic developer and process of development Download PDF

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Publication number
US2192891A
US2192891A US184037A US18403738A US2192891A US 2192891 A US2192891 A US 2192891A US 184037 A US184037 A US 184037A US 18403738 A US18403738 A US 18403738A US 2192891 A US2192891 A US 2192891A
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US
United States
Prior art keywords
aminopyridine
development
developer
photographic developer
halogen
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
US184037A
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English (en)
Inventor
Borst Helmut
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Individual
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Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2192891A publication Critical patent/US2192891A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03C5/305—Additives other than developers

Definitions

  • This invention relates to improvements in voperates up to 10 minutes unobjectionably withphotographic developers and processes of deout fogging, whereas a corresponding developer *velopment; 1 withthe addition of collidine after a time of de-'
  • a corresponding developer *velopment; 1 withthe addition of collidine after a time of de-'
  • collidine after a time of de-'
  • For the production of the pleasant blue-black velopment of 10 minutes produces considerable 5 shades of developed silver inphotographic emulfogging, which moreover is produce'd'before the 6 sions, a series of blue-black developing sub end of that period.
  • a i 1 stances is known. These substances have, howi In the case of 2.4.6-trimeth'ylpyridine there is ever, certain disadvantages.
  • developers according to the invention 30 in solid orliquid form contain the specified sub- Monomethyl-p-aminophenol hydrochloa stance.
  • g 2 As particularly suitable substances may be Hydroquinoneuu j 6 mentioned the salts of the halogen-substituted Anhydrous sodium sulphite g 30 2-aminopyr idines, for example 5-iodo-2-amino- Anhydrous sodium carbonate g 30 a pyridine, 5-bromo-2-aminopyridine, 5-chloro-2- Potassium bromide 1 ..g L 0.7 aminopyridine, 5-chloro-2-acetylaminopyridine, Water ccf 1000 354mm?z"ammpyridine and (1) Addition of 0.1 gbor 3.5-dichloro-2-aminopyridine hydrochloride tothis developer base.
  • An article of manufacture comprising a photographic developer containing a silver halide developing agent and a halogen-substituted aminopyridine.
  • An article of manufacture comprising a photographic developer containing a silver halide developing agent and a 5-halogen-2-amino- Pyridine.
  • An article of manufacture comprising a photographic developer containing a silver halide developing agent and 3.5-dichloro-2-aminopyridine.
  • An article of manufacture comprising a photographic developer containing a silver halide developing agent and 3.5-dichloro-2-aminopyridine-hydrochloride.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pyridine Compounds (AREA)
US184037A 1936-12-21 1938-01-08 Photographic developer and process of development Expired - Lifetime US2192891A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE494468X 1936-12-21

Publications (1)

Publication Number Publication Date
US2192891A true US2192891A (en) 1940-03-12

Family

ID=6544720

Family Applications (1)

Application Number Title Priority Date Filing Date
US184037A Expired - Lifetime US2192891A (en) 1936-12-21 1938-01-08 Photographic developer and process of development

Country Status (4)

Country Link
US (1) US2192891A (es)
BE (1) BE425342A (es)
FR (1) FR830985A (es)
GB (1) GB494468A (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465678A (en) * 1947-03-19 1949-03-29 Donald B Ellig Machine for sharpening knife blades
US2476541A (en) * 1947-11-18 1949-07-19 Gen Aniline & Film Corp Process for producing multilayer color negatives containing masking images for colorcorrection purposes
US2983605A (en) * 1955-01-31 1961-05-09 Polaroid Corp Photographic products, processes, and compositions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465678A (en) * 1947-03-19 1949-03-29 Donald B Ellig Machine for sharpening knife blades
US2476541A (en) * 1947-11-18 1949-07-19 Gen Aniline & Film Corp Process for producing multilayer color negatives containing masking images for colorcorrection purposes
US2983605A (en) * 1955-01-31 1961-05-09 Polaroid Corp Photographic products, processes, and compositions

Also Published As

Publication number Publication date
BE425342A (es)
GB494468A (en) 1938-10-26
FR830985A (fr) 1938-08-16

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