Silver halide photographic developer compositions and process for the formation of photographic silver images
CA 1313082 C · Owner: Marchesano, Carlo · Inventors: Marchesano, Carlo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
60557-3272, Photographic Silver Halide Developer Compositions and Process For Forming Photographic, Silver Images ABSTRACT OF THE DISCLOSURE, An aqueous alkaline photographic silver halide developer composition comprising a dihydroxy benzene developing agent an, auxiliary superadditive developing agent an antifogging agent, an, antioxidant and a buffering agent characterized by the fact that, the composition further comprises a stabilizing amount of an .alpha.ketocarboxylic acid. The developer composition has a better resistance against air oxidation and can be left in continuous transport automatic processors for several days without undergoing any substantial decrease of its developing …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 26, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 26, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.