Use of surface-active alkyl glycoside compounds in water- and oil-based drilling fluids and other drill-hole treatment agents
CA 2088697 C · Owner: Henkel Kommanditgesellschaft Auf Aktien · Inventors: Weuthen, Manfred; Mueller, Heinz; Herold, Claus-Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Described is the use of surface-active alkyl glycoside compounds as ecologically compatible emulsifiers of the W/O type and O/W type, respectively in, fluid and pumpable drilling fluids and other fluid drilling-hole treatment agents which comprise a continuous or a dispersed oil phase together with an aqueous phase and which are suitable for an environmentally acceptable exploitation of geological resources for example oil or natural gas deposits. The invention further relates to inverted drilling fluids which are suitable for a non-polluting exploitation of geological resources and contain a continuous oil phase and, present therein, a dispersed aqueous phase together with emulsifiers, …
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
- Filed July 25, 1991 and granted April 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 2013.
- 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.