Code-division multiple-access base station transmitter
CA 2179977 C · Owner: Sato, Toshifumi · Inventors: Sato, Toshifumi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a code-division multiple-access base station transmitter a digital base-band section includes spread units for directly spreading input transmission data for each channel by different spread codes to output spread signals a summer for summing the spread signals and for outputting a multiplexed spread signal a limiter for limiting the amplitude of the multiplexed spread signal so as not to exceed a predetermined value and a roll-off filter for limiting a transmission spectrum by shaping a waveform of the transmission signal and for outputting a digital base-band signal to an analog base-band/RF section. The analog base-band/RF section converts the digital base-band signal into an analog …
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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 June 26, 1996 and granted August 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 26, 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.