Potassic drilling mud
CA 1281175 C · Owner: Zucca, Giovanni · Inventors: Radenti, Giuseppe; Zucca, Giovanni; Palumbo, Sergio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
POTASSIC DRILLING MUD", Abstract, The drilling mud according to the invention comprises as its potassium source the potassium salt of a cellulose carboxymethyl ether which is obtained by submitting a cellulose to carboxymethylation by the action of a mono-chloroacetic acid, after a preliminary activation with KOH.
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 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2008.
- 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.