Heat-resistant sintered hard alloy
CA 2060723 C · Owner: Toyo Kohan Co. Ltd. · Inventors: Isobe, Yoshihiko; Komai, Masao; Takagi, Kenichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat-resistant sintered hard alloy comprises 35% to 95% by weight of a WCoB type complex boride in a cobalt base alloy. The alloy contains 1.5% to 4.1% boron, 19.1% to 69.7% tungsten optionally 1 to 25% chromium, the balance being cobalt and a maximum of 1% impurities. Nickel, iron and/or copper may be substituted for portions of the cobalt content.
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 February 5, 1992 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 5, 2014.
- 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.