Steel for rotor shafts of electric machines
CA 2063355 C · Owner: Mori, Takanobu · Inventors: Mori, Takanobu; Fukui, Yutaka; Kuriyama, Mitso
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to new low-alloy steel compositions and rotor shafts for electric machines made such steel. High nickel and chromium contents ensure high strength and toughness, while other components, notably silicon and other impurities, are kept low with the result that magnetic properties remain good. One aspect provides a steel with the following proportions by weight:, C 0.15 to 0.3% Si 0.1%, Mn 1%, Ni 3 to 5%, Cr 2%, 3.5% (Mo + W) 0.1 to 1.0%, W being optional V 0.03 to 0.35%; and, the remainder substantially Fe.
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 March 18, 1992 and granted December 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2014.
- 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.