Method of coating alumina particles with refractory material, abrasive particles made by the method and abrasive products containing the same
CA 2080598 A1 · Owner: Minnesota Mining And Manufacturing Company · Inventors: Storer, Jonathan G.; Carpenter, Michael W.; Martin, Lawrence L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abrasive particles comprising a core of alumina-based mineral coated by cathodic arc deposition with a metal boride carbide, or, nitride refractory material are provided. The core can be fused alumina or an alumina-based ceramic. Improved abrasive products having at least a portion of their conventional abrasive particles replaced with the coated abrasive particles are also provided.
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 March 26, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2013.
- 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.