Electronic switching power supply
CA 2078573 C · Owner: Braun Aktiengesellschaft · Inventors: Schwarz, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electronic switch supply unit contains a blocking oscillator with a transformer (5). The primary coil (51) of the transformer is connected in series with the collector-emitter section of a transistor (I) parallel with the input voltage source (20) and the secondary coil (52) of the transformer is connected in series with a consumer (6) and a diode (7). The emitter of the transistor (1) is connected through a first resistor (8) to earth or reference potential and the base of the transistor (1) is connected to a control circuit (St). A capacitor (16) is connected in parallel with the consumer (6), which may be a direct current motor. The voltage at the connection (B) of the capacitor (16) …
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 20, 1991 and granted December 16, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 2013.
- 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.