Selective calling receiver and system for sharing selective calling numbers and information calling numbers
CA 2208378 A1 · Owner: Amma,Sadayuki · Inventors: Amma,Sadayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paging system (selective calling receiver system) has a transmission sequence between a base station and a pager (selective calling receiver). The base station of the system transmits one of the calling numbers assigned to the pager based on a predetermined timing sequence. The pager receives a calling number from the base station. A memory of the pager stores calling numbers and prohibited codes assigned there to. The prohibit codes indicates whether the stored calling numbers are allowed or prohibited, and is coordinated with the predetermined timing sequence of the base station. The pager evaluates whether the received calling number is the same as one of the allowed calling numbers …
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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 June 20, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 20, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 20, 2019.
- 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.