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Expired Canadian patentCanada

Amorphous silicon photoreceptors for electrophotography, process for the preparation and/or regeneration thereof, and method for the electrophotography using such materials

CA 1267804 C · Owner: Yamaguchi, Yukio · Inventors: Kamoshita, Yasuo; Yamaguchi, Yukio; Sekihara, Kiyoshi

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Abstract From the Canadian patent

An amorphous silicon photoreceptor for electrophotography having a specific surface roughness is disclosed herein. Also provided are a process for the preparation and/or regeneration of the material and improved methods for electrophotography, which use a special abrasive. The material enables the electrophotography without occurrence of any image blurring under high humidity conditions.

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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 April 17, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 17, 2007.
  • 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 4, 1986
GrantedApril 17, 1990
Term endedApril 17, 2007
Patent numberCA 1267804 C
Classification (IPC)G03G21/00 +1 more

Timeline

Timeline From CIPO dates

1987199019931996199920022005Application filedApril 4, 1986Patent grantedApril 17, 1990Term endedApril 17, 2007

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