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Expired Canadian patentCanada

Broadcast and alternate message time slot interchanger

CA 1164587 A · Owner: Western Electric Company, Incorporated · Inventors: Drechsler, Rudolph C.; Abbott, Robert P.; Chow, Ming-Chwan

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

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Abstract From the Canadian patent

The present invention relates to an apparatus for interchanging time slots. The apparatus is comprised of an input terminal which is adapted to receive an input frame. The input frame has a first plurality of input time slots with each input time slot communicating a sample of information. A data storage unit is provided having a plurality of storage locations. A unit is provided for extending an input time slot sample from an input time slot through a storage location to an output time slot and thence to an output terminal for insertion in an output frame. The output frame has a second plurality of time slots. A unit is provided for inserting an alternate message in one or more output time …

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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 March 27, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 2001.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 29, 1983
GrantedMarch 27, 1984
Term endedMarch 27, 2001
Patent numberCA 1164587 A
Classification (IPC)H04J3/17

Timeline

Timeline From CIPO dates

198419861988199019921994199619982000Application filedMarch 29, 1983Patent grantedMarch 27, 1984Term endedMarch 27, 2001

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