Air operated earth drilling tool
CA 2356570 A1 · Owner: Bunney, Larry R. · Inventors: Mcgillivray, Miles; Bunney, Larry R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An air operated earth drilling tool includes a tubular housing having a first end, a second end and an air flow, passage. A filter adapted to remove solid contaminants is positioned at the first end of the housing. A metering valve is positioned on the air flow passage, whereby the volume of air passing through the downhole motor assembly is metered to provide a selected rotational speed. An inner mandrel with a central air flow passage is telescopically received in the second end of the housing and is rotatable relative to the housing. One or more rotatable power section are provided with outwardly extending vanes, such that air passing by the vanes rotates the power sections. The power …
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 September 5, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 5, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 2023.
- 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.