Aluminum hydroxide, process for preparation thereof and composition
CA 2004673 C · Owner: Morihira, Mitsuhiko · Inventors: Morooka, Osamu; Morihira, Mitsuhiko; Yokoo, Kazuyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aluminum hydroxide having a particle size of 2 to 30 µm and having small specific surface area and low resin filling viscosity can be prepared by using precipitated aluminum hydroxide composed of secondary agglomerated particles having a primary particle size almost equal to the desired average particle size of intended pulverized aluminum hydroxide as the starting material to be pulverized and pulverizing this starting aluminum hydroxide. This aluminum hydroxide has an average particle size of 2 to 30 µm a surface, roughness coefficient Sr/Sc (in which Sr represents the specific surface area of particles measured by the nitrogen adsorption method and Sc represents the specific surface area …
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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
- Filed December 5, 1989 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 5, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 5, 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
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.