Radio having a combined pll and afc loop and method of operating the same
CA 2118810 C · Owner: Waldie, William T. · Inventors: Waldie, William T.; Heck, Joseph P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A radio (100) having a combined phase locked loop (PLL) (207) and an automatic frequency control (AFC) loop (215 109, 111) and method of operating the same. A mixer (201) converts the received RF signal (117) to an intermediate frequency (IF) signal (219) responsive to an injection signal (217). The PLL (207) locks the injection signal (217) to the received RF signal (117) responsive to a reference signal (119). The AFC loop (215 109, 111) locks the reference signal (119) to the received RF signal (117) responsive to the injection signal (217).
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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 8, 1993 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2015.
- 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.