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Expired Canadian patentCanada

Method and apparatus for frame synchronization

CA 1304844 C · Owner: Fujitsu Limited · Inventors: Soejima, Tetsuo; Iguchi, Kazuo; Watanabe, Toshiaki

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Abstract From the Canadian patent

A frame synchronization method in which a synchronization detection of a frame synchronization signal using one of n-multiplexed frame synchronization signals derived from a sequence of frame synchronization signals each delayed by one bit from the preceding frame synchronization signal, a synchronization confirmation as synchronization guard by detecting a repetition of the synchronization detections of the frame synchronization signal, a confirmation of the subsequent frame identification signal based on the synchronization confirmation; and a separation of the received multiplexed signals into a plurality of channels based on the synchronization confirmed frame synchronization signal and …

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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 July 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 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.
FiledMarch 6, 1989
GrantedJuly 7, 1992
Term endedJuly 7, 2009
Patent numberCA 1304844 C
Classification (IPC)H04J3/06 +1 more

Timeline

Timeline From CIPO dates

1990199219941996199820002002200420062008Application filedMarch 6, 1989Patent grantedJuly 7, 1992Term endedJuly 7, 2009

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