Monitoring system for radio communication apparatus
CA 1306501 C · Owner: Shimizu, Toshimitsu · Inventors: Shimizu, Toshimitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A monitoring method and system for a radio communication apparatus including a base station and various portable units are described. The invention involves transmitting a first request signal from the base station to each of the portable units for a first predetermined cycle period and then replying with a first response signal from each of the portable units to the base station only when each of the portable units has a change of operation state. A second request signal is then transmitted from the base station to each of the portable units when the base station receives the first response signal from each of the portable units. A third request signal is transmitted from the base station …
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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 August 18, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 18, 2009.
- 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.