High pressure downhole progressive cavity drilling apparatus with lubricating flow restrictor
CA 2046899 A1 · Owner: Ide, Russell D. · Inventors: Ide, Russell D.; Ide, Russell D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A progressive cavity drilling apparatus which includes a drill bit (26), a drill bit driving shaft (16) have a hollow bore (25) formed therein and a progressive cavity drive train (A) for driving the drilling shaft (16). A flow restrictor (42) is provided to cause fluid leaving the progressive cavity drive train to enter the interior of the hollow drilling shaft and then to be exited therefrom through nozzles formed in the drill bit. The flow restrictor includes a groove (44) to allow a small amount of fluid to flow in a path winding around the circumference of the flow restrictor (42) and into a bearing assembly (30) located below the flow restrictor (42). Because the flow path winds …
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 December 20, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 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.