Paging receiver and radio frequency channel searching method for the same
CA 2108309 C · Owner: Kondo, Hisashi · Inventors: Kondo, Hisashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paging receiver is provided for use with a plurality of paging service systems transmitting different radio frequency channels. The paging receiver searches for every reception channel and determines object reception channels by referring to system information identifying each service system, and comprises electric field detection means for detecting the electric field strength of radio frequency channels and reception channel control means for controlling searching for radio frequency channels and determining object reception channel. The reception control means immediately switches the radio frequency channel when the received electric field strength is not greater than a prescribed …
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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 October 13, 1993 and granted February 22, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 13, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 13, 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.