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Expired Canadian patentCanada

Data error detection circuit

CA 1285074 C · Owner: Koshikawa, Joutarou · Inventors: Koshikawa, Joutarou; Irie, Toshio; Watanabe, Tomoharu

CIPO record

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Abstract From the Canadian patent

A data error detection circuit which detects error of high speed universal data formed by repeating low speed data frame a number of times at a high speed. The invention involves converting the input high speed universal data into parallel data from serial data, outputting in parallel the same bits of a repeated data frame, and detecting data error in the case where a continuous non-coincidence of such parallel output data exceeds a specified number of times is detected. This discriminates data error from changes resulting from partition in the repetition of the data.

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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 June 18, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 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.
FiledJune 9, 1987
GrantedJune 18, 1991
Term endedJune 18, 2008
Patent numberCA 1285074 C
Classification (IPC)H04L1/08

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJune 9, 1987Patent grantedJune 18, 1991Term endedJune 18, 2008

Sources & verification

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