Photographic silver halide emulsion containing a copolymer with 8-hydroxy quinoline groups
CA 1090643 A · Owner: Agfa-Gevaert Aktiengesellschaft · Inventors: Wolff, Erich; Saleck, Wilhelm; Freitag, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHOTOGRAPHIC SILVER HALIDE EMULSION, (Abstract of the Disclosure) The sensitivity of silver halide emulsions is increased if the silver halide is precipitated in the presence of a peptisation agent which consists partially or wholly of a copolymer comprising 0.1 to 20 mol% of recurring structural units of the formula, in which X is hydrogen or alkyl having 1 to 4 carbon atoms and Y is a 8-hydroxyquinoline group attached through its 5- or 7-position.
Read the whole patent
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 December 2, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 2, 1997.
- 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.