Switching power supply unit
CA 2291198 C · Owner: Hosotani, Tatsuya · Inventors: Hosotani, Tatsuya
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 providing a DC output comprises a DC power supply; a transformer having a primary winding; a main switching element for connecting in series to the primary winding; and an auxiliary switching element for performing ON/OFF operations in synchronism with or opposite to ON/OFF operations performed by the main switching element; wherein an auxiliary switching element drive winding for generating a voltage turning on/off the auxiliary switching element is disposed in the transformer; and a first impedance circuit including a first resistor a first capacitor being connected in series with the first impedance circuit and a differentiating circuit for determining 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 November 29, 1999 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2021.
- 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.