Buffer regulated mud acid for treating underground formations
CA 1062449 A · Owner: Shell Canada Limited · Inventors: Richardson, Edwin A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In reacting a siliceous material with an acidic solution containing hydrogen fluoride, the reaction rate is kept relatively low by contacting the material with an aqueous solution of a fluoride salt a weak acid and, a weak acid salt in proportions that maintain a significant but low concentration of hydrogen fluoride in the solution.
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 September 18, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 18, 1996.
- 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.