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Expired Canadian patentCanada

Photographic material having a heat developable layer and a layer containing an azoaniline dye

CA 1085666 A · Owner: Eastman Kodak Company · Inventors: Willis, Roland G.

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Abstract From the Canadian patent

Abstract of the Disclosure In a heat developable photographic material and process for providing a dye enhanced silver image an element, comprising a support having thereon in reactive association: (A) at least one heat developable photographic layer comprising (i) photosensitive silver halide (ii) at least, one active silver halide developing agent (iii) an, activating concentration of a development activator precursor and (iv) a polymeric binder and (B) at least one layer comprising an azoaniline dye that is bleached in the non-image areas of the described element upon development of a latent image in the layer (A) by uniformly heating can provide, an improved image. After imagewise …

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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 September 16, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 1997.
  • 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 12, 1977
GrantedSeptember 16, 1980
Term endedSeptember 16, 1997
Patent numberCA 1085666 A
Classification (IPC)G03C1/58 +2 more

Timeline

Timeline From CIPO dates

1978198019821984198619881990199219941996Application filedApril 12, 1977Patent grantedSep 16, 1980Term endedSep 16, 1997

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