Cellular mobile telephone system
CA 2227162 C · Owner: Nec Corporation · Inventors: Vasic, Dobzica
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to reproduce a highly precise carrier for a coherent detection in a cellular, mobile CDMA system, a first stage carrier estimation is performed by using pilot symbols, inserted into a receiving signal having a known code pattern. A data symbol train of the, receiving signal is preparatively detected by using the estimated carrier and a second, stage carrier estimation is performed for the receiving signal by using the detected data, symbol train and the pilot symbols.
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 January 16, 1998 and granted July 9, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2020.
- 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.