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Expired Canadian patentCanada

Apparatus for recording and/or reproducing digital information signal

CA 1250661 A · Owner: Sony Corporation · Inventors: Fukami, Tadashi; Odaka, Kentaro; Ozaki, Shinya

CIPO record

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Abstract From the Canadian patent

An apparatus for recording and/or reproducing digital information signal with sampling frequencies fs1 fs2, fs3,---, fsn comprising circuit for selecting one of the sampling frequency, and circuit for generating a field clock having a field frequency F determined by a following equation; fs1/N1 = fs2/N2 = fs3/N3 = --- = fsn/Nn = F whereas N1, N2, N3, ---Nn are the number of data words in one field.

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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 February 28, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 28, 2006.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 27, 1984
GrantedFebruary 28, 1989
Term endedFebruary 28, 2006
Patent numberCA 1250661 A
Classification (IPC)G11B5/09 +2 more

Timeline

Timeline From CIPO dates

19851988199119941997200020032006Application filedJune 27, 1984Patent grantedFeb 28, 1989Term endedFeb 28, 2006

Sources & verification

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