Expired Canadian patentCanada
Process for producing magnesium aluminate spinel
CA 1077238 A · Owner: Quigley Company · Inventors: Belding, Jeffrey H.; Letzgus, Erwin A.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is the production of high purity magnesium aluminate spinel by blending alumina as ESP fines with a finely divided source of magnesia in a MgO:A12O3 weight ratio of between about 0.4 to 0.8 and firing the blend at 900°C. or above.
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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 May 13, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedMay 13, 1980
Term endedMay 13, 1997
Patent numberCA 1077238 A
Classification (IPC)C04B35/44 +2 more
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.