GB1274436A — Process for the sensitization of photographic silver chloride and silver chlorobromide emulsions that may contain colour couplers
Assigned to Filmfabrik Wolfen VEB · Expires 1972-05-17 · 54y expired
What this patent protects
1,274,436. Optically sensitized emulsions. FILMFABRIK WOLFEN VEB. June 9, 1970, No.27831/70. Heading G2C. [Also in Division C4] Silver halide emulsions are sensitized with dyes of the formula: - where R 1 and R 4 are H, CI, CN, COOH, or COOAlkyl; R 2 , R 3 , R 5 and R 6 are a…
USPTO Abstract
1,274,436. Optically sensitized emulsions. FILMFABRIK WOLFEN VEB. June 9, 1970, No.27831/70. Heading G2C. [Also in Division C4] Silver halide emulsions are sensitized with dyes of the formula: - where R 1 and R 4 are H, CI, CN, COOH, or COOAlkyl; R 2 , R 3 , R 5 and R 6 are alkyl with at least 16C, one of said alkyl groups containing at least 3 carbon atoms and another of said groups containing at least 6 carbon atoms and X is an anion.
Drugs covered by this patent
Bibliographic data sourced from FDA Orange Book + USPTO public records. Plain-English summary generated by AI grounded in source text. Patent term extensions (PTR, SPC, pediatric) may shift the effective expiry. Not legal advice.
Track this patent
Get a daily-checked alert when vulnerability score, expiry, classification, or assignee changes. Email, Slack, or Teams delivery. Pro: 50 watches, Free: 3.