Bi-centered drill bit having enhanced casing drill-out capability and improved directional stability
CA 2545568 A1 · Owner: Beaton, Timothy P. · Inventors: Hoffmaster, Carl; Beaton, Timothy P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A bi-center drill bit is disclosed which includes a bit body having pilot blades and, reaming blades distributed azimuthally around the body. The blades have cutting, elements disposed thereon at selected positions. The body and blades define a longitudinal axis of the bit and a pass-through axis of the bit. In one aspect, selected, ones of the pilot blades include thereon longitudinally between the pilot , blades and the reaming blades, a pilot hole conditioning section including gage faces. The gage faces, define a diameter intermediate a pilot hole diameter and a pass-through diameter defined, respectively, by the pilot blades and the reaming blades.
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 June 4, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 4, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 4, 2024.
- 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.