Photographic products employing nondiffusible n',n'-diarylsulfonohydrazide compounds capable of releasing photographically useful groups
CA 1259513 A · Owner: Eastman Kodak Company · Inventors: Singer, Stephen P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHOTOGRAPHIC PRODUCTS EMPLOYING, NONDIFFUSIBLE N',N'-DIAROMATIC CARBOCYCLIC - OR DIAROMATIC HETEROCYCLIC SULFONOHYDRAZIDE COMPOUNDS CAPABLE OF RELEASING PHOTOGRAPHICALLY USEFUL GROUPS Abstract of the Disclosure, Photographic elements and assemblages are described which employ nondiffusible N',N'-diaromatic carbocyclic - or diaromatic heterocyclic sulfonohydrazide compounds which are capable of releasing photographically useful groups in an imagewise manner as a function of silver halide development.
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 September 19, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 19, 2006.
- 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.