Non-dispersible vermiculite products
CA 1311973 C · Owner: Hercules Incorporated · Inventors: Brungardt, Clement L.; Rush, Pamela K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A process for improving the water resistance of shaped articles formed by removing the water from an aqueous dispersion of vermiculite lamellae containing a cationic polyamine or an anionic polyacrylamide, and the shaped articles so formed are, disclosed.
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 December 29, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 29, 2009.
- 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.