Impedance matching circuit
CA 2010004 C · Owner: Disser, Robert J. · Inventors: Disser, Robert J.; Lehnhoff, Richard N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure The disclosure describes an impedance matching circuit for maintaining the input impedance of a drive, transistor as sensed by a driver circuit substantially, constant. The circuit is connected to the input of the drive transistor such that when the drive transistor is forward biased, the input impedance sensed by the driver circuit is the input impedance of the drive transistor, and when the drive transistor is reverse biased, the input impedance sensed by the driver circuit is the combination of the input impedance of the drive transistor and an impedance of the matching circuit.
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 February 15, 1990 and granted February 1, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2012.
- 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.