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Expired Canadian patentCanada

Digital signal transmission system having frame synchronization operation

CA 1269733 C · Owner: Kajiwara, Masanori · Inventors: Takeo, Hiroshi; Nakaide, Hiroshi; Washiyama, Ikuo

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Abstract From the Canadian patent

A digital signal transmission system includes a synchronization pattern detection circuit for detecting a synchronization pattern in response to a received transmitted digital signal, a pseudo synchronization detection circuit for detecting a pseudo synchronization pattern in the form of cyclic redundancy code in response to a received transmitted digital signal and a synchro-, nization protection circuit for counting the synchronization pattern detection signals produced when synchronization patterns are detected in response to a synchronization pattern detection signal from the synchronization pattern detection circuit. The synchronization protection circuit includes a main …

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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 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 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.
FiledJuly 25, 1986
GrantedMay 29, 1990
Term endedMay 29, 2007
Patent numberCA 1269733 C
Classification (IPC)H04L7/00 +2 more

Timeline

Timeline From CIPO dates

1987199019931996199920022005Application filedJuly 25, 1986Patent grantedMay 29, 1990Term endedMay 29, 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.