Expired Canadian patentCanada
Process for coating crystalline silica polymorphs
CA 1201700 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Yang, Duck J.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TITLE, Process For Coating Crystalline Silica Polymorphs ABSTRACT OF THE DISCLOSURE, Process for coating crystalline silica polymorphs such as silicalites and zeolites with amorphous silica using alkali metal silicates as the source of silica.
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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 March 11, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 11, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 13, 1983
GrantedMarch 11, 1986
Term endedMarch 11, 2003
Patent numberCA 1201700 A
Classification (IPC)B01J21/08 +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.