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Expired Canadian patentCanada

Time synchronization master station and remote station system

CA 1136864 A · Owner: Control Data Corporation · Inventors: Vangen, Robert F.

CIPO record

Overview

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

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Abstract From the Canadian patent

A time synchronization system involves a master station sending time information to a remote station and in which a portion of the time message is used as a trigger to start a counter or interval clock in the remote station. When the time message is concluded the remote station adds the time in the interval clock or counter to the time from the message received to create an actual time which replaces the existing time information in the remote station clock. The time portion of the message sent represents the actual time at which the trigger in the time message was actuated and represents a later portion of the message as sent.

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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 December 7, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 21, 1981
GrantedDecember 7, 1982
Term endedDecember 7, 1999
Patent numberCA 1136864 A
Classification (IPC)G04G7/00 +2 more

Timeline

Timeline From CIPO dates

198219841986198819901992199419961998Application filedApril 21, 1981Patent grantedDec 7, 1982Term endedDec 7, 1999

Sources & verification

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