Two stage downhole drilling fluid filter
CA 2438826 C · Owner: Downton, Geoff · Inventors: Menger, Christian; Downton, Geoff; Phan, Henry
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A two stage filter for drilling fluid using downhole tools filters solid materials from the drilling fluid and has a first outer filter section and a second, inner filter section. A portion of the drilling fluid flowing through the first section is received by the second section and passed on to the fluid using device of the tool. A flow area of the first filter section is greater than a flow area of the second filter section.
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 August 28, 2003 and granted April 12, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.