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Expired Canadian patentCanada

Color photographs, a process for preparing them and color photographic materials employed therefor

CA 1338796 C · Owner: Fuji Photo Film Co. Ltd. · Inventors: Furutachi, Nobuo; Takahashi, Osamu; Morigaki, Masakazu

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Abstract From the Canadian patent

There is provided a color photograph improved in preservability that has been obtained by making chemically inactive the aromatic amine type color developing agents and their oxidized product that remains in the silver halide photographic materials after color development processing. The color photograph exhibits excellent performance in that its white background can be prevented from discoloring even during long-term storage or display, and deterioration of a dye image caused by the remaining color developing agent being taken into the photographic material after the color development, bleaching, and fixing processes or due to its, oxidized product, can be prevented.

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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 December 17, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 17, 2013.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJanuary 25, 1988
GrantedDecember 17, 1996
Term endedDecember 17, 2013
Patent numberCA 1338796 C
Classification (IPC)G03C7/26 +1 more

Timeline

Timeline From CIPO dates

198919921995199820012004200720102013Application filedJan 25, 1988Patent grantedDec 17, 1996Term endedDec 17, 2013

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.