Canadian application, no grantCanada
Drilling fluid
CA 2044048 A1 · Owner: Van Laar, Hermanus Geert · Inventors: Van Laar, Hermanus Geert; Davidson, Colin James
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Drilling liquid comprising a mixture of powdered sulphur dispersed in an aqueous liquid, the amount of sulphur being between 0.03 and 0.30 kg per kg of drilling liquid. hsbprf:t6100prd.doc D10
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 June 6, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 6, 1991
GrantedNo grant recorded
Term endedJune 6, 2011
Patent numberCA 2044048 A1
Classification (IPC)C09K8/16
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.