Anti-balling cutting structure
CA 2033548 A1 · Owner: Hughes Tool Company · Inventors: Isbell, Matthew R.; Pessier, Rudolf C.O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A three cone earth boring bit having circumferential rows of earth disintegrating teeth of wear resistant inserts of selected projection from the cone surfaces, one cone having an inner row separated from a heel row by a narrow circumferential groove and a second cone having a hell-catching row that intermeshes with the narrow groove by an amount to minimize balling. A nozzle directs a jet stream with a high velocity core past the cone and inserts of adjacent cutters to the bore hole bottom to break up the filter cake while the lower velocity skirt strikes the material packed between the inserts of adjacent cones. A row of small diameter recessed reaming inserts replaces the conventional …
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 January 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 2013.
- 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.