Choke for controlling the flow of drilling mud
CA 2491925 A1 · Owner: @Balance B.V. · Inventors: Van Riet, Egbert Jan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a drilling system and method for drilling a well bore into an earth formation, comprising:- drilling means for drilling a well bore;pumping means for pumping drilling fluid into the well bore during drilling; and - a drilling fluid outlet system for retrieving drilling fluid from the well bore, said drilling fluid outlet system comprising choke means for choking the return flow of retrieved drilling fluid and alternating means for , alternating the flow direction through the choking means.
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 24, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2025.
- 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.