Hard and tough sintered body for a cutting tool
CA 2219638 C · Owner: Nakai, Tetsuo · Inventors: Uesaka, Shinya; Kukino, Satoru; Nakai, Tetsuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sintered body for a cutting tool consists of high-pressure phase boron nitride a residual binder phase, plus unavoidable impurities and contains high-pressure phase boron nitride powder which has been previously coated with a binder before sintering. The coating binder consists of an element belonging to group 4a 5a or 6a of the periodic table, and has an average thickness of 5 to 300 nm. Binder powder other than the coating binder consists of an element belonging to group 4a 5a or 6a of the periodic table, and the contact ratio of high-pressure phase boron nitride is at least 20% and less than 50%. The product is a high-pressure phase boron nitride-based hard and tough sintered body for …
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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 October 28, 1997 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 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.