A steerable drilling assembly for mounting on the end of a drill string to drill a borehole in an underground formation
CA 2123889 A1 · Owner: H T C A/S · Inventors: HALLUNDBæK, JõRGEN
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A steerable drilling assembly for mounting on the end of a drill string serves to drill a horizontal borehole in an underground formation. The drilling assembly comprises a mud motor and a drill bit driven by said mud motor and having an axis of rotation which forms an angle with the axis of the drilling assembly, as well as a self-propelling drive assembly for substantially translatorily advancing the drilling assembly in the formation and exerting on the drill bit the pressure necessary for the drilling, said drive assembly being provided with driven wheels which are pressed against the wall of the borehole by the mud pressure and are pulled free from the wall when the pressure is …
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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 November 18, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 18, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 18, 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.