Coupling circuit
CA 2132003 C · Owner: Collier, Edward J. · Inventors: Collier, Edward J.; Mazi, David A.; Freuler, George H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A circuit for coupling a signal source (Vi) producing a signal having a given voltage waveform to a load (6) having two ends, the circuit being composed of: a load voltage control unit (A1) connectable between the signal source and one end of the load for producing across the load (6) a voltage corresponding to the signal voltage; and a load current control unit (A2) connectable to the load (6) and operable independently of the signal source (Vi) for producing a current flow through the load (6) sufficient to cause the voltage across the load (6) or the current through the load (5) to have the given waveform.
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 15, 1993 and granted September 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 15, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 15, 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.