Cellular telephone interface system for amps and cdma data services
CA 2267333 A1 · Owner: Willkie, James J. · Inventors: Phillips, Marc S.; Doan, David B.; Willkie, James J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The cellular telephone interface system has the capability to automatically choose between AMPS and CDMA cellular transmission protocols for data transmissions. The cellular telephone interface system includes a PC-modem card, such as a PCMCIA card (8), for interconnecting the cellular telephone (4) to a data source, such as a laptop computer portable facsimile machine, or the like. The cellular telephone (4) is capable of transmission in accordance with either AMPS or CDMA transmission protocols. For AMPS the PC-, modem card (8) converts data signals received from the data source into PCM signals for forwarding to the cellular telephone (4). The cellular telephone converts the PCM …
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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 September 24, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 24, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 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.