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Expired Canadian patentCanada

Photoconductor device for imaging a linear object

CA 1101973 A · Owner: Northern Telecom Limited · Inventors: Baraff, David R.; Kos, Steven

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

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Abstract From the Canadian patent

Abstract of the Disclosure, A photoconductive device for imaging a linear object has a plurality of photoconductive elements extending in a, line, on a substrate, with first and second patterns of electrical conductors, a pattern on each side of the line. Connections are made to the elements. The conductor patterns are formed as columns on one side of the line and as rows on the other side to provide connections between columns and elements and rows and elements such that the number of external connections is minimized. By applying a voltage to a column and then, connecting a detector circuit sequentially to each row and repeating for, each column, the current flowing through each element …

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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 May 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
  • 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 26, 1978
GrantedMay 26, 1981
Term endedMay 26, 1998
Patent numberCA 1101973 A
Classification (IPC)H01L31/14 +1 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedSep 26, 1978Patent grantedMay 26, 1981Term endedMay 26, 1998

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