Two-way paging system with answer-back function
CA 2061697 C · Owner: Minami, Yoichiro · Inventors: Minami, Yoichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
After bit synchronization and frame, synchronization are established in accordance with a transmission signal from a transmission office reception RX is stopped until a reception timing assigned to a group of a portable radio unit comes. A receiving operation is performed again at the reception timing assigned to the group of the unit. If the ID code of the received signal coincides with the ID of the unit, an informing operation is performed. At the same time, transmission TX is performed. A transmitting operation is performed during a transmission signal stop period TXOF upon completion of transmission of data corresponding to all the eight groups. The transmission timing of the portable …
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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 February 24, 1992 and granted February 25, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2014.
- 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.