Patent Yard Sign in
Expired Canadian patentCanada

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

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract 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.
FiledJuly 25, 1991
GrantedApril 8, 2003
Term endedJuly 25, 2011
Patent numberCA 2088697 C
Classification (IPC)B01F17/56 +2 more

Timeline

Timeline From CIPO dates

1992199419961998200020022004200620082010Application filedJuly 25, 1991Patent grantedApril 8, 2003Term endedJuly 25, 2011

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.