Oil, gas or geothermal drilling apparatus
CA 2104010 C · Owner: Leroy, Andre · Inventors: Leroy, Andre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The subject of the invention is an oil gas or geothermal drilling rig comprising a central tool and a coaxial bit in which the central tool is driven by the rotor of a downhole motor powered by the drilling mud and in which the bit is driven from the surface, by a drilling string that is part of a rotary system the string subjecting the device to an axial force characterized in that, between the stator (4) of the downhole motor and the shank (5) of the bit there is a sliding link that allows the two tools to move axially relative to each other and a spring (6) is positioned between the stator (4) and the shank (5) so that it is compressed by the stator when the central tool tends to lag …
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 April 3, 1992 and granted December 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 3, 2014.
- 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.