Fsk production by modification of antenna impedance
CA 2295191 A1 · Owner: Ut Automotive Dearborn, Inc. · Inventors: Kulha, Steven P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio frequency transmitter circuit (14) including a user input switch (34) for producing an input signal, an oscillator (16) for producing a frequency signal having a first frequency, an antenna (22) connected to the oscillator for broadcasting the frequency signal, a coupling circuit (18) disposed a predetermined distance from the antenna and a microprocessor (32) for , enabling the oscillator and activating the coupling circuit in response to the input signal. When the coupling circuit is activated a reflected impedance, derived from a change in inductance is reflected from the coupling circuit upon the antenna thereby shifting the frequency signal to a second frequency. …
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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 July 16, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2021.
- 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.