US2185798A - Photographic emulsion - Google Patents

Photographic emulsion Download PDF

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Publication number
US2185798A
US2185798A US223873A US22387338A US2185798A US 2185798 A US2185798 A US 2185798A US 223873 A US223873 A US 223873A US 22387338 A US22387338 A US 22387338A US 2185798 A US2185798 A US 2185798A
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US
United States
Prior art keywords
naphthyl
grams
ccms
ether
dihydrothiodiazole
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
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US223873A
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English (en)
Inventor
Stevens Rene
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Individual
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Individual
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Publication date
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Publication of US2185798A publication Critical patent/US2185798A/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08Sensitivity-increasing substances
    • G03C1/10Organic substances
    • G03C1/12Methine and polymethine dyes

Definitions

  • Naphthyl-thiodiazolines such as are used as starting materials in Examples 7 to 10, can be obtained in a similar manner as the corresponding
  • alpha-naphthyl-hydrazines which are treated according to the method of Freund-Schuftan (Berichte der Deutschen Chemischen Geselll CzHi-N- N schaft, vol. 24, page 4183) with an excess of acetic anhydrid, yielding needles of Nacetyl-N alpha-naphthyl-hydrazine with a melting point of 142-143 C. This compound is thereafter boiled during half an hour with P285 in benzene,

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Plural Heterocyclic Compounds (AREA)
US223873A 1935-05-09 1938-08-09 Photographic emulsion Expired - Lifetime US2185798A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT479926X 1935-05-09

Publications (1)

Publication Number Publication Date
US2185798A true US2185798A (en) 1940-01-02

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ID=3674919

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US223873A Expired - Lifetime US2185798A (en) 1935-05-09 1938-08-09 Photographic emulsion

Country Status (3)

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US (1) US2185798A (en, 2012)
BE (1) BE415463A (en, 2012)
GB (1) GB479926A (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476525A (en) * 1946-08-15 1949-07-19 Gen Aniline & Film Corp Trinuclear cyanine dyes
US2519797A (en) * 1944-08-21 1950-08-22 Imperiai Chemical Ind Ltd Sesquicyanines
US2525015A (en) * 1946-06-17 1950-10-10 Gevaert Photo Prod Nv Methine dyestuffs
US2693472A (en) * 1950-03-20 1954-11-02 Ilford Ltd Polymethine compounds

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519797A (en) * 1944-08-21 1950-08-22 Imperiai Chemical Ind Ltd Sesquicyanines
US2525015A (en) * 1946-06-17 1950-10-10 Gevaert Photo Prod Nv Methine dyestuffs
US2476525A (en) * 1946-08-15 1949-07-19 Gen Aniline & Film Corp Trinuclear cyanine dyes
US2693472A (en) * 1950-03-20 1954-11-02 Ilford Ltd Polymethine compounds

Also Published As

Publication number Publication date
GB479926A (en) 1938-02-14
BE415463A (en, 2012)

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