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Expired Canadian patentCanada

Surfactant-like material in a hydrophilic layer adjacent a stripping layer for diffusion transfer assemblages

CA 1248399 A · Owner: Eastman Kodak Company · Inventors: Bishop, John F.

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Abstract From the Canadian patent

Abstract of the Disclosure Photographic assemblages and processes are described wherein a stripping layer is employed to enable an image-receiving layer to be separated from the rest of the assemblage after processing. Each side of the stripping layer has a hydrophilic layer immediately adjacent thereto, only one of which contains a surfactant-like material having a hydrocarbon fatty tail of at least eight carbon atoms which is remote from a polar group, the material being present in an amount sufficient to enable a clean separation between the image-receiving layer and the portion of the assemblage containing the silver halide emulsion layer. Transparencies or prints which are less bulky …

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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 January 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 10, 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.
FiledDecember 19, 1984
GrantedJanuary 10, 1989
Term endedJanuary 10, 2006
Patent numberCA 1248399 A
Classification (IPC)G03C1/40 +1 more

Timeline

Timeline From CIPO dates

19851988199119941997200020032006Application filedDec 19, 1984Patent grantedJan 10, 1989Term endedJan 10, 2006

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