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Expired Canadian patentCanada

Apparatus for reproducing a digital signal

CA 1307586 C · Owner: Sony Corporation · Inventors: Odaka, Kentaro; Ozaki, Shinya; Fukami, Tadashi

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

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Abstract From the Canadian patent

In an apparatus for reproducing a digital signal wherein a signal is read by a plurality of reproducing rotary heads which trace a track with an interval narrower than the interval of tracks formed on a tape a, wrap angle with which a tape is wrapped around the periphery of a rotary drum to which the rotary heads are attached is selected to be less than 360°/n with respect to the number n (n is an integer) of rotary heads the, rotary heads are rotated at a speed twice the normal rotational speed of the heads, the demodulated digital signal is stored in a memory corresponding to a frame address and a block address detected from the reproduced digital signal, and then the digital signal …

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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 September 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 15, 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.
FiledAugust 20, 1987
GrantedSeptember 15, 1992
Term endedSeptember 15, 2009
Patent numberCA 1307586 C
Classification (IPC)G11B5/00 +2 more

Timeline

Timeline From CIPO dates

19881991199419972000200320062009Application filedAug 20, 1987Patent grantedSep 15, 1992Term endedSep 15, 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.