Rf duplexer bypassing techniques for transceivers
CA 2192497 C · Owner: Lucent Technologies Inc. · Inventors: Fok, Wilson
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved RF switching techniques operate in conjunction with an existing cellular telephone having an RF amplifier an antenna, receiver circuitry, a duplexer and a battery. The duplexer has a first port adapted for connection to the receiver circuitry, a second port adapted for connection to the RF amplifier and a third port, adapted for connection to the antenna. The improved RF switching techniques are characterized by a first switch, a second switch and a battery of less than 6.0 volts. The first switch, coupled to the RF amplifier connects the RF amplifier to any one of the antenna and the second port of the duplexer. A second switch coupled to the antenna, connects the antenna to any …
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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 December 10, 1996 and granted September 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 10, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 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.