Inverter with shared chopper function for high input power factor with restrained higher harmonies
CA 2058207 C · Owner: Matsushita Electric Works, Ltd. · Inventors: Maehara, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inverter device achieving a high input power-factor while restraining higher harmonics to be low is provided by a simple circuit structure in which a, pulsating DC voltage supplied through a rectifier is provided through an inductor to a smoothing condenser and to an inverter circuit section connected to output ends of the rectifier to be in parallel therewith a smoothed DC, voltage from the smoothing condenser is supplied through the inductor to the inverter circuit section and a high, frequency voltage is provided out of the device in response to ON and OFF operation of a switching means in the inverter circuit section.
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 December 20, 1991 and granted April 22, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 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.