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Expired Canadian patentCanada

Radiographic elements exhibiting reduced crossover

CA 1304254 C · Owner: Dickerson, Robert E. · Inventors: Kelly, James E.; Dickerson, Robert E.; Daubendiek, Richard L.

CIPO record

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Abstract From the Canadian patent

Abstract of the Disclosure, A radiographic element is disclosed having a support capable of transmitting blue light and coated on each of two opposite major faces of said support, a silver halide emulsion layer capable of forming a latent image in response to exposure to blue light. Interposed between at least one of the latent image forming emulsion layers and the support is a blue absorbing silver iodide emulsion layer exhibiting at temperatures below 25°C an absorption transition wavelength that is bathochromically displaced by at least 20 nm as compared to the absorption transition wavelength of B phase silver iodide.

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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 June 30, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 30, 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.
FiledJanuary 15, 1987
GrantedJune 30, 1992
Term endedJune 30, 2009
Patent numberCA 1304254 C
Classification (IPC)G03C5/16 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedJan 15, 1987Patent grantedJune 30, 1992Term endedJune 30, 2009

Sources & verification

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