Electronic exchange apparatus
CA 2087633 C · Owner: Honbou, Shinichi · Inventors: Fujitsuka, Shuji; Honbou, Shinichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic exchange apparatus includes a plurality of extension circuits having terminals to which a plurality of extension terminals are connected a memory, table in which a plurality of extension numbers corresponding to the extension circuits are registered and a, control circuit for retrieving an extension number of a destination of an incaming signal from the memory table. The electronic exchange apparatus comprises a change request detector for detecting a change request signal supplied from one of the extension terminals to request a change in contents registered in the memory table and, a memory table changing section for changing the contents registered in the memory table …
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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
- Filed January 20, 1993 and granted August 31, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2015.
- 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.