Retrievable center bit
CA 2496199 C · Owner: Hughes, John · Inventors: Warren, Tommy M.; Hughes, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A retrievable center bit for use with a tubular including an inner bore and a drill shoe cutter mounted thereon. The retrievable center bit may include a body positionable in the bore of the tubular and including an upper end a lower end and a side outer surface extending therebetween. A cutting surface may be supported on the lower end of the bit body. There may be a locking assembly on the body for releasably locking the bit axially and rotationally to the tubular. A longitudinal bore may extend from the upper end into the body and the body may include a fluid port extending from the bore to open on the cutting surface and a lateral fluid port extending from the bore opening on the side …
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 February 8, 2005 and granted October 1, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 8, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.