Switching power supply unit
CA 2296205 C · Owner: Tani, Ryota · Inventors: Nakahira, Koji; Nishida, Akio; Tani, Ryota
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A switching power supply unit includes a DC power supply, a transformer having a primary winding a, secondary winding and a feedback winding a main, switching element connected in series to the primary winding, and a control circuit connected between the feedback winding and the control terminal of the main switching element, so that a DC output can be obtained. In this switching power supply unit there are provided, a voltage generating unit disposed on the primary side of the transformer to output a voltage according to a load power, and a delay circuit fore reducing the switching frequency by delaying the turn-on of the main switching element according to a voltage output from the …
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 January 17, 2000 and granted July 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 17, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 17, 2022.
- 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.