Trunk interface circuit
CA 1134931 A · Owner: Western Electric Company, Incorporated · Inventors: Gavrilovich, Charles D.; Anderson, Eugene S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A trunk interface circuit is disclosed for executing communication and signaling functions associated with telephone calls between subscriber stations of separate telecommunication systems. A semiautonomous control circuit is responsive to state signals generated by a central control circuit for establishing the trunk interface circuit in a plurality of states. The semiautonomous control circuit comprises a memory having predetermined data stored therein corresponding to each of the plurality of states. A processor within the semiautonomous control circuit executes certain of the communication and signaling functions as determined by the stored data corresponding …
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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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 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.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.