Water-wettable drilling mud additives containing uintaite
CA 2046879 A1 · Owner: Davis, Neal Ii · Inventors: Davis, Neal Ii; Christensen, K. Clark; Nuzzolo, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water-based drilling mud additive comprising a pre-blended combination of about 2 parts of high softening point uintaite about , 1 part of a lower softening point uintaite about 1 part of, causticized lignite, and a strongly lipophilic non-ionic surfactant, is disclosed. This composition decreases shale sloughing and borehole instability during drilling of wells.
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
- Filed February 16, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2012.
- 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.