Apparatus for removing shared waves
CA 2230231 C · Owner: Matsumoto, Shinji · Inventors: Uchida, Yoshinori; Matsumoto, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
After amplification of a predetermined frequency component fo+nfd of an intermediate frequency signal extracted by a mixer (44), a shared wave signal thereof is demodulated and modulated, thereby reproducing TDMA serving as a shared wave signal. Further, a subtracter (51) subtracts the TDMA serving as the shared wave signal from the intermediate frequency signal to extract CDMA#1 signal serving as a desired wave signal.
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 November 29, 1996 and granted January 15, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2018.
- 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.