Railway wheel and manufacturing method of the railway wheel
CA 2195287 C · Owner: Makino, Taizo · Inventors: Anjiki, Manao; Daitoh, Yoshihiro; Fujimura, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is an object of the invention to provide a solid railway wheel and a method of manufacturing the wheel which satisfies both of wear resistance and heat-crack resistance good for use in a high-speed railway vehicle. In the wheel of the invention the chemical, composition of a base steel comprises: 0.4% to 0.75%C; 0.4% to 0.95%Si; 0.6% to 1.2%Mn; and less than 0.2%Cr. Especially, the content of Cr is preferably 0.05% to less than 0.2% and more preferably 0.07% to less than 0.15%. It is characterized in that the wheel has pearlitic structure in a region of at least 50 mm in depth from the tread surface of the wheel. Since the relatively high Si content and the relatively low Cr content are …
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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 16, 1997 and granted January 23, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 2019.
- 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.