2,5-bis (secondary amino) oxa-and thiadiazole photographic developing agents
CA 1094858 A · Owner: Eastman Kodak Company · Inventors: Altland, Henry W.; Cowan, Stanley W.; Olivares, Ismael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2,5-BIS(SECONDARY AMINO) OXA- AND, THIADIAZOLE PHOTOGRAPHIC DEVELOPING AGENTS Abstract of the Disclosure, Oxa- and thiadiazole compounds of the formula: wherein R-NH- and -NH-R, are secondary amino groups and X is sulfur or oxygen are employed as photographic developing agents for exposed radiation-sensitive silver salts. The developing agents can be employed as components in developer compositions, as incorporated developing agents and as, developing agents in diffusion transfer processes. -1-
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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 February 3, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 3, 1998.
- 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
Timeline From CIPO dates
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.