Additive composition for release of stuck drill pipe
CA 1205823 A · Owner: Exxon Research And Engineering Company · Inventors: Matthews, Patricia C.; Walker, Thad O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An additive composition effective in the release of stuck pipe in a borehole during a drilling operation which composition contains propoxylated C18-C32 alkanols an oil-soluble emulsifier-wetting agent and a liquid hydrocarbon diluent.
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 June 10, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 10, 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.
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.