Enhanced cross-flow with two jet drilling
CA 1095502 A · Owner: Smith International, Inc. · Inventors: Baker, William, Iii; Allen, James H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to hydraulic circulation systems for cleaning holes being drilled in rock and earth with drilling bits. One of the limiting parameters in three-cutter drill bits in the past is the lack of space for fluid flow passage from the hole bottom to the top of the bit. The present invention overcomes this deficiency of the prior art by providing a drill bit having three cone-shaped cutters and formed with two drilling fluid nozzles on opposite sides of one of the cutters and with an enlarged return passage for the drilling fluid formed between the other two cutters. Flow restrictors adjacent the two nozzles restrict the flow of return fluid in those areas. A flow diverter in …
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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
- Granted February 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 1998.
- 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.