Process for the production of electrofusion corundum
CA 1107938 A · Owner: Dynamit Nobel Aktiengesellschaft · Inventors: Neidhardt, Manfred; Rehfeld, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High-purity .alpha.-electrocorundum is produced by heating alumina having an alkali content of between 0.05 and 0.60 weight percent and an A12O3 content of more than 95 weight percent in, admixture with SiO2 in an electric arc furnace at a temperature sufficient to form a melt thereof, cooling the melt whereby to form a composition comprising an .alpha.-corundum phase in a siliceous matrix and thereafter separating the siliceous matrix from the .alpha.-corundum phase. The process of the invention enables normal, commercially available aluminas with comparatively high alkali contents to be used. The corundun manufactured by this process possesses an improved surface activity and has an …
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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
- Granted September 1, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 1, 1998.
- 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.