A self-excited oscillator type switch power supply with overcurrent protection
CA 2198096 C · Owner: Wong, Tak Tai · Inventors: Wong, Tak Tai
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A self-excitation type switch power supply unit with overcurrent protection. For adopting a simple and reliable current negative feedback protective circuit to coordinate with a complementary bridge circuit a , positive, feedback circuit without DC biasing capacitive coupling an oscillation-, starting, circuit of the AC power supply etc. so that the self-excitation type switch power supply can become a practical power supply unit with simple circuitry small size and low cost.
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 August 30, 1995 and granted January 1, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 30, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 30, 2017.
- 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.