Inverter circuit and a method for controlling same
CA 2007023 C · Owner: Danfoss A/S · Inventors: Harvest, Nils-Ole
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An inverter circuit is provided in which two semiconductor switching elements are arranged in series between the positive and negative pole of a d.c. source. An alternating current can be derived between the two semiconductor switching elements. The two semiconductor switching elements are operated with a pulse width-modulated operating signal it being possible for, the scanning ratio to vary this signal in time to produce a current at the inverter outlet that correspondingly varies with time. Each semiconductor switching element requires a certain switching off period to be changed from a conductive into the non-conductive condition after the arrival of a command. The switching off period …
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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 3, 1990 and granted September 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2012.
- 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.