Silicon carbide bodies having high toughness and fracture resistance and method of making same
CA 2025862 A1 · Owner: Storm, Roger S. · Inventors: Chia, Kai Y.; Boecker, Wolfgang D. G.; Storm, Roger S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sintered silicon carbide ceramic body preferably produced from a uniform mixture comprising from about 82 percent to about 99.4 percent by weight siliconcarbide from about 0.5 percent to about 10 percent by weight of a nitrogen containing aluminum compound and from about 0.1 to about 8 percent of a rare earth oxide, both reacted with oxygen, wherein said sintered ceramic body has a density greater than 90% percent of theoretical and a fracture toughness as, measured by a single edge notched beam test of more than 7 MPam1/2, and method, of making the same.
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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 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 2012.
- 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.