Hard composite and method of making the same
CA 2229082 C · Owner: Greenfield, Mark S. · Inventors: Greenfield, Mark S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of heat treating a sintered body having an exposed surface which has the steps of: providing a sintered body comprised of a hard carbide and a binder, the binder being present in the sintered body at a first binder level and the hard carbide in the sintered body being of a first grain size; placing granules of a sacrificial sintered material in contact with at least one portion of the exposed surface of the sintered body the sacrificial sintered , material comprised of the hard carbide and the binder the binder being , present in the sacrificial sintered material at a second binder level and the hard carbide in the sacrificial sintered material being of a second grain size; …
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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 July 3, 1996 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 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.