Silicon carbide sintered abrasive grain and process for producing same
CA 2114571 A1 · Owner: Van Dijen, Franciscus · Inventors: Mayer, Edgar; Van Dijen, Franciscus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pressureless sintering of .alpha.-silicon carbide powder with oxidic sintering additives, in particular aluminum oxide/yttrium oxide, produces abrasive grain with considerably improved strength which is also suitable for applications of the type for which conventional silicon carbide abrasive grain is too brittle.
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 January 31, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 31, 2016.
- 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.