Drilling fluids containing novel compositions of matter
CA 1134855 A · Owner: Gulf Research & Development Company · Inventors: Schulz, Johann G.D.; Zajac, Jaroslav
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drilling fluid containing a new composition of matter resulting from the reaction of (1) substantially waterinsoluble polycyclic, polycarboxylic acids obtained as a result of the oxidation of coal with (2) a base. The new composition of matter is also claimed.
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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
- 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.