Expired Canadian patentCanada
Permeability restoration of damaged formations
CA 1263838 C · Owner: Marathon Oil Company · Inventors: Sydansk, Robert D.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Permeability to a subterranean hydrocarbon-bearing formation having sustained damage from exposure to an encroaching fluid is restored and maintained by treating the formation with a damage-reversing brine followed by a stabilizing solution.
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 12, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 12, 2006.
- 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 23, 1986
GrantedDecember 12, 1989
Term endedDecember 12, 2006
Patent numberCA 1263838 C
Classification (IPC)E21B43/25 +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.