Dispersible boehmite alumina
CA 1082885 A · Owner: National Silicates, Ltd. · Inventors: Joyce, Ivan H.; Itzkovitch, Irwin J.; Hertzenberg, Elliot P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the preparation of finely divided dispersible alpha-alumina monohydrate (boehmite) from alumina trihydrate is disclosed. The alumina trihydrate is calcined thereby increasing the surface area through a partial dehydration. The calcined intermediate is slurried in water and heated under pressure to achieve crystallization and rehydration. Conventional drying methods are used to obtain the particles. The particle size of the product is much smaller than that of the starting raw material.
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 August 5, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 5, 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.
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.