Frequency divider with variable capacitance
CA 2091753 A1 · Owner: Security Tag Systems, Inc. · Inventors: Charlot, Lincoln H. Jr.; Lian, Ming Ren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
FREQUENCY DIVIDER with VARIABLE: CAPACITANCE ABSTRACT OF THE DISCLOSURE, A frequency divider includes an inductor connected in parallel with a variable capacitance to define a resonant circuit for detecting electromagnetic radiation at a first predetermined frequency and for responding to said detection by transmitting electromagnetic radiation at a second frequency that is one-halfthe first frequency with the circuit being resonant at the second frequency when there is zero voltage across the capacitance. the variable capacitance includes a lamination of an insulation material and a semiconductor material disposed between metal terminals, such that as a voltage applied across the terminals …
Read the whole patent
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 March 16, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 16, 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.