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Expired Canadian patentCanada

Charged-coupled device with diode cut-off input

CA 1291567 C · Owner: Pelgrom, Marcellinus J.M. · Inventors: Pelgrom, Marcellinus J.M.; Heijns, Hendrik

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Abstract From the Canadian patent

Semiconductor device. The invention relates to a CCD having a so-called diode cut-off input, a reference voltage being applied to the input diode and the input signal being supplied to an input gate located in front of the first clock electrode. Especially if the electrodes are composed of a transfer part and a storage part with an incorporated potential difference, it is possible that incomplete charge transport occurs from the input to the first clock electrode. In order to avoid this incomplete charge transport and/or to be able to enlarge the dynamic range of the input signal a larger clock voltage, for example 10 V is applied to, the first clock electrode than to the following clock …

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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 October 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 29, 2008.
  • 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 2, 1987
GrantedOctober 29, 1991
Term endedOctober 29, 2008
Patent numberCA 1291567 C
Classification (IPC)G11C19/28 +1 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedApril 2, 1987Patent grantedOct 29, 1991Term endedOct 29, 2008

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