Super-yield bentonite base drilling fluid
CA 1069288 A · Owner: American Colloid Company · Inventors: Clem, Arthur G.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A super-yield bentonite base drilling fluid composition is provided having a yield of more than 500 barrels per ton of bentonite comprising water, bentonite clay, and a partial calcium salt of polyacrylic acid in an amount greater than about 7% by weight based on the total weight of bentonite. The fluid exhibits excellent viscosity, gelation and filtrate loss characteristics at extremely low bentonite levels.
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.