Expired Canadian patentCanada
Method to form a fluid barrier with sloped drains, notably for use near oil wells
CA 1297785 C · Owner: Gadelle, Claude · Inventors: Gadelle, Claude; Petit, Herve
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 March 24, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 24, 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.
FiledDecember 21, 1984
GrantedMarch 24, 1992
Term endedMarch 24, 2009
Patent numberCA 1297785 C
Classification (IPC)E21B33/13 +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.