Method of making .beta."-alumina
CA 1328982 C · Owner: Thackeray, Michael Makepeace · Inventors: Barrow, Peter; Thackeray, Michael Makepeace; Duncan, Graham Kirk
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method of making .beta."-alumina by heating aluminium oxide in the presence of Na2O. A metal oxide dopant in the form of Li2O, MgO, ZnO, CoO, NiO, FeO or mixtures thereof or, a precursor of the dopant, is dispersed in a cubic-close packed aluminium oxide or a precursor thereof to form a starting mixture which is calcined by heating to 250-1100°C in an oxygencontaining atmosphere. Na2O is then dispersed in the calcined starting mixture to form a final mixture and the final mixture, is heated in an oxygen-containing atmosphere to above 1100°C to produce .beta."-alumina.
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
- Granted May 3, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2011.
- 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.