Alumina hydrates
CA 1331504 C · Owner: Alcan International Limited · Inventors: Brown, Stephen Clifford
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making alumina hydrate particles suitable as fillers in materials such as paper rubber, and plastics compositions is described. The particles have a surface area ranging from about 2 to 15 m2/g a, polydispersity not exceeding 0.3 and a content of soluble soda not exceeding 0.02%.
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 23, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 23, 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.