Spring steel with excellent resistance to hydrogen embrittlement and fatigue
CA 2188746 F · Owner: Ibaraki, Nobuhiko · Inventors: Nagao, Mamoru; Nakayama, Takenori; Iwata, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a spring steel with excellent performance characterized in that the spring steel is produced by making a spring steel contain an, appropriate amount of at least one or more of Ti Nb, Zr, Ta, and Hf, thereby , generating fine inclusions including carbide, nitride ,sulfides and/or their complex compounds, to, make the inclusions exert the effect of trapping diffusive hydrogen whereby the, resistance to hydrogen embrittlement is enhanced wherein the size and number , of the, coarse inclusions are regulated thereby suppressing the decrease of the fatigue life. The spring steel can provide a valve spring or a suspension spring or the like, with, enhanced …
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 October 24, 1996 and granted January 2, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 24, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2018.
- 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.