Colour-photographic recording material
CA 1214675 A · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Leppard, David G.; Rody, Jean
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Colour-photographic recording material Abstract, A colour-photographic recording material which in, at least one light-sensitive silver halide emulsion layer an interlayer and/or a protective layer contains at least, one polyalkylpiperidine compound of the formula I (I), as a light stabiliser. Colour images obtained by imagewise exposure and development of this colour-photographic recording material display good stability to the action of visible and ultraviolet light. With respect to the definitions of the substituents and symbols in formula I, reference is made to claim 1.
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, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 2, 2003.
- 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.