Sintered friction material
CA 2246311 A1 · Owner: Yamashita, Yukinori · Inventors: Yamashita, Yukinori; Takemoto, Takatoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sintered friction material has a matrix of a copper-system metal and contains a specific additive, graphite and potassium titanate as friction conditioners. The specific additive consists of at least one material selected from a group consisting of zirconium oxide silica, dolomite, orthoclase and magnesium oxide. The specific additive the graphite and, the potassium titanate are preferably blended in volume ratios of 1 to 15 % 10 to 50 % and 5 to 30 % respectively. The form of the potassium titanate is preferably at least one of whiskery platy and spherical forms. Thus, the sintered friction material can compatibly improve its abrasion resistance and suppress abrasion of the counterpart …
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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 September 2, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 2, 2020.
- 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.