Patent Yard Sign in
Expired Canadian patentCanada

Method for processing silver halide photo-sensitive material

CA 1306895 C · Owner: Onodera, Kaoru · Inventors: Ohbayashi, Keiji; Murai, Kazuhiro; Onodera, Kaoru

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract From the Canadian patent

Processing an imagewise exposed light-sensitive silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer containing silver halide grains which are sensitized with a sensitizing dye represented by general formula I: I , (wherein, Z1 and Z2 independently represent a group of atoms necessary to complete a heterocyclic ring consisting of a thiazole, a benzothiazole, a selenazole a benzo-, selenazole, a naphthoselenazole a benzimidazole, a naphtho-, imidazole a pyridine or a quinoline ring, wherein said heterocyclic ring may have a substituent; R1 and R2 are independently selected from a group consisting of an alkyl group, an alkenyl group …

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 1, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 2009.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 21, 1987
GrantedSeptember 1, 1992
Term endedSeptember 1, 2009
Patent numberCA 1306895 C
Classification (IPC)G03C7/40 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedApril 21, 1987Patent grantedSep 1, 1992Term endedSep 1, 2009

Sources & verification

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