Telephone switching system switch processor interface
CA 1248616 A · Owner: American Telephone And Telegraph Company · Inventors: Pederson, Leif K.; Chan, Norman C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, The interface circuit of this invention eliminates the separation between hard-wired telephone switching system computer facilities and the customer owned switchably connectable computer facilities. A general purpose communication interface is provided which connects the customer provided computer facilities to both the switching network and the hard-wired computer facilities of the telephone switching system via the standard telephone switching system port circuit. This general purpose communication interface enables the customer provided computer facilities to communicate directly with the telephone switching system processor, thereby providing the customer with direct access to …
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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 January 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 10, 2006.
- 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.