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Expired Canadian patentCanada

Tdma/tdm interfacing

CA 1266136 C · Owner: Edwards, Steven John · Inventors: Edwards, Steven John; Ballance, John William

CIPO record

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

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Abstract From the Canadian patent

An interface for connecting a station using a time division multiplex format to a time division multiaccess system comprising (a) a first channel for converting time division multiplexed signals into bursts (b) a duplex channel for re-constituting bursts into time division multiplex frames and (c) TDMA circuitry for controlling (a) and (b) to operate in conformity with the TDMA. The first channel is preferably adapted to remove unused slots from the multiplex and to collect the used slots over several frames into a single burst. The duplex channel restores the frame format by replacing slots removed by the transmitter.

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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 20, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 20, 2007.
  • 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 3, 1986
GrantedFebruary 20, 1990
Term endedFebruary 20, 2007
Patent numberCA 1266136 C
Classification (IPC)H04B7/24 +1 more

Timeline

Timeline From CIPO dates

1987199019931996199920022005Application filedMarch 3, 1986Patent grantedFeb 20, 1990Term endedFeb 20, 2007

Sources & verification

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