Communication apparatus
CA 2255295 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Watanabe, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abbreviated dial number table and special number table are provided in external memory in control unit of digital button telephone system. For each of abbreviated dial numbers, the abbreviated dial number table stores a destination phone number prefixed with a special number concerning whether notice of a call originating party identification number should be permitted. For each of destination identification numbers, the special number table stores the special number. At call origination, it is determined whether dial data is an identification number of destination or an abbreviated dial number. If the dial data is an abbreviated dial number, reference to the abbreviated dial number table …
Read the whole patent
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 December 8, 1998 and granted March 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 8, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2020.
- 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.