Apparatus for reducing a linear velocity of entrained particles in an air drilling return air stream
CA 2282945 A1 · Owner: Smith, David George · Inventors: Smith, David George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for reducing a linear velocity of entrained particles in an air drilling return air stream. The method involves the step of directing the return air stream containing entrained particles at a cushion formed by a counter current of air. It is preferred that the linear velocity of the return air stream be lowered after impact with the counter current of air. It is also preferred that the counter current of air is created by redirecting a portion of the return air stream. The apparatus for accomplishing this results includes a hollow body having an interior target surface with a plurality of perpendicular baffles forming pockets for redirecting the return air stream. An …
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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 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 2021.
- 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.