Ac-excited rotary electric machine system
CA 2022375 C · Owner: Ohno, Yasuteru · Inventors: Shiozaki, Junichi; Bando, Akira; Nakagawa, Hiroto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An AC-excited rotary electric machine system includes an AC-excited rotary machine having a primary winding connected to an AC power line and a secondary winding connected to a frequency converter. A primary current detector detects a current flowing through a primary winding of an AC-excited rotary machine. In response to a detection value detected by the primary current detector, a secondary current controller changes the range of a command value for the current flowing through the secondary winding of the AC-excited rotary machine to a predetermined range.
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 July 31, 1990 and granted November 19, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 31, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 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.