Protective overcoat for photographic elements
CA 1248255 A · Owner: Eastman Kodak Company · Inventors: Keogh, Philip L.; Steklenski, David J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
i-, PROTECTIVE OVERCOAT FOR PHOTOGRAPHIC ELEMENTS Abstract of the Disclosure, A polymer blend comprising cellulose nitrate and a polymer characterized in that a) the polymer comprises at least 70 weight percent of polymerized recurring units derived from a hydrophobic monomer selected from the group consisting of styrene alkyl, acrylates and alkyl methacrylates and 10 to 24 weight percent of polymerized recurring units derived from an acid monomer selected from the group consisting of methacrylic acid and acrylic acid; and b) the blend comprises from 20 to 70 weight percent of cellulose nitrate and from 8 to 15 weight percent of the polymerized recurring acid monomer and is useful as a …
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 January 3, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 3, 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.