Process for preparing ultrafine aluminum nitride powder
CA 2126343 A1 · Owner: Eisman, Glenn A. · Inventors: Cochran, Gene A.; Weimer, Alan W.; Henley, John P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Rapidly heat powdered aluminum an admixture of powdered aluminum, and a compatible solid material a powdered admixture of alumina, and carbon or aluminum nitride powder having a surface area lower than desired in the presence of a source of nitrogen at a temperature of 2473 to 3073 K to produce aluminum nitride then, promptly quench the aluminum nitride product. The product has a surface area of greater than 10 m2/g, preferably greater than 15 m2/g.
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 December 9, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 9, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 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.