Cellular telephone call detail recording system
CA 2046736 A1 · Owner: Hardin, Stephen T. · Inventors: Ikeda, Akira; Higuchi, Masayuki; Kotatsu, Sadao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A cellular telephone call detail recording system which includes at least one cellular telephone a call detail memory, in the telephone for storing call details; a call detail processing computer located externally to the cellular telephone for processing the call details and a connecting arrangement for connecting the cellular telephone and the call detail processing computer. The system may further include a protocol conversion unit for matching the protocol of the cellular telephone and the call detail processing arrangement.
Read the whole patent
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 July 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 10, 2013.
- 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.