Drill bit and system for drilling a borehole
CA 2525793 C · Owner: Savignat, Jean-Michel Claude Gaston · Inventors: Zijsling, Djurre Hans; Savignat, Jean-Michel Claude Gaston
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A drill bit having a central longitudinal axis and comprising: - a pilot section (1) for drilling a pilot bore section of the borehole; - an underreaming section (3) in a following position with respect to the pilot section (1); - a connecting shaft (4) extending between the pilot section (1) and the under-reaming section (3); - a stabilising section (2) located between the pilot section (1) and the under-reaming section (3) wherein the stabilising , section (2) fits inside the pilot bore section and is capable of laterally stabilising the drill bit while allowing rotation of at least the pilot section (1).
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 May 18, 2004 and granted August 28, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 18, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 18, 2026.
- 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.