Process for recovering oil from subterranean formations
CA 1196571 A · Owner: Deutsche Texaco Aktiengesellschaft · Inventors: Schnepel, Frank-Michael; Volz, Hartwig
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method of using polymer flooding solutions in tertiary oil recovery operations in which polymer loss is substantially reduced by the use of aqueous solutions of polyethylene glycol or polypropylene glycol or both, having a molecular weight of from about 600 to about 6,000. The method is particularly effective under high salinity conditions.
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 November 12, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 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.
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.