Expired Canadian patentCanada
Material containing sodium silicates usable, among other things, as thermal insulation for heavy oil yielding wells
CA 1192002 A · Owner: Institut Francais Du Petrole · Inventors: Lesage, Jean; Mergier, Nicole; Auneau, Louis
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 20, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledNovember 24, 1983
GrantedAugust 20, 1985
Term endedAugust 20, 2002
Patent numberCA 1192002 A
Classification (IPC)C01B33/32 +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.