Long-life induction-hardened bearing steel
CA 2181918 C · Owner: Ochi, Tatsuro · Inventors: Ochi, Tatsuro; Kawauchi, Yuji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention aims at providing a induction hardened bearing steel which can produce bearing parts at a low cost and can provide excellent rolling fatigue characteristics, the present invention provides a long life high-frequency-hardened bearing steel comprising in, terms of percent by weight, 0.45 to 0.7% of C 0.05 to, 1.7% of Si, 0.35 to 2.0% of Mn 0.001 to 0.039% of S, 0.01, to 0.07% of A? 0.003 to 0.015% of N 0.0005 to 0.03% of, T.Mg, 0.005 to 1.2% of Mo a specific amount of at least, one member selected from the group consisting of Cr Ni, V, Nb and B, and more than 0.025% of P and not more than, 0.004% of Ti and not more than 0.002% of T.O wherein a, number ratio of Mg type oxides …
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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 November 24, 1995 and granted April 4, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 24, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 2017.
- 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.