Radio loop-back test method having improved reliability and a system using the test method
CA 2207965 C · Owner: Watanabe, Nozomu · Inventors: Watanabe, Nozomu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a radio loop-back test system for a radio apparatus in which a transmitter (15) transmits a first radio signal in response to a transmission signal and which a receiver (16) receives a second radio signal to produce a reception signal, a comparing portion (22) compares the reception signal with the transmission signal to produce a comparison result signal. An interference detection portion (23) detects whether or not the reception signal has an interference component unrelated with the first radio signal. The interference detection portion produces an interference detection signal when the reception signal has the interference component. The comparison result signal is controlled by an …
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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 16, 1997 and granted May 8, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 16, 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.