Drilling fluid
CA 1248743 A · Owner: Shell Canada Limited · Inventors: Bol, Gerard M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drilling fluid comprising:, a) at least one polymeric viscosifier b) at least one polymeric fluid loss reducer c) at least one high molecular weight organic polycationic polymeric coagulant and/or flocculant. The objective of the present invention is to assess the possibilities of coagulants or flocculants for the improvement of solids removal from the drilling fluid. BMRH04
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 January 17, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 2006.
- 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.