Water-based drilling and well-servicing fluids with swellable, synthetic layer silicates
CA 1296513 C · Owner: Herold, Claus-Peter · Inventors: Von Tapavizca, Stephan; Mueller, Heinz; Wichelhaus, Winfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Synthetic swellable layer silicates corresponding to the following formula, MgO aMA bAl2O3 cS1O2 aH2O (I) in which, M is Na+ and Li+ having an Na:Li ratio of at least 1; A is F-, OH- or ? O2- or a mixture thereof; a is 0.1 to 0.6;, b is 0 to 0.3;, c is 1.2 to 1.7; and n is 0 to 3Ø, are used in water-based well-servicing fluids as a hightemperature-stable thixotrope substantially unaffected by alkaline earth metal ions.
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 March 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 2009.
- 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.