Clay-free wellbore fluid comprising guar gum
CA 1069289 A · Owner: Brinadd Company · Inventors: Jackson, Jack M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A clay-free, i.e. non-argillaceous wellbore fluid having, unstructured viscosity is obtained by combining water with an additive composition comprising hydroxy alkyl guar gum and at least 10 weight percent of magnesia or magnesium hydroxide based on the weight of hydroxy alkyl guar gum.
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 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 8, 1997.
- 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.