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Expired Canadian patentCanada

Method for processing a photothermographic element

CA 2106024 C · Owner: Young, Gordon Daniel · Inventors: Dedio, Edward Lewis; Young, Gordon Daniel

CIPO record

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

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Abstract From the Canadian patent

A photothermographic element comprising a photosensitive silver halide, an organic silver salt and a reducing agent in concentrations such that imagewise exposure to actinic radiation generates from the silver halide a catalyst which accelerates an image-forming reaction between the organic silver salt and the reducing agent is processed by a method comprising the steps of (1) imagewise-exposing the element to actinic radiation to form a latent image therein, (2) subjecting the imagewise-exposed element to a first heating step at a temperature and for a time sufficient to intensify the latent image but insufficient to produce a visible image and thereafter, (3) subjecting the element to a …

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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

  • Filed September 13, 1993 and granted January 7, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 13, 2013.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 2015.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 13, 1993
GrantedJanuary 7, 1997
Term endedSeptember 13, 2013
Patent numberCA 2106024 C
Classification (IPC)G03C5/29 +2 more

Timeline

Timeline From CIPO dates

1994199619982000200220042006200820102012Application filedSep 13, 1993Patent grantedJan 7, 1997Term endedSep 13, 2013

Sources & verification

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