Deep-borehole drilling device
CA 1262454 C · Owner: Eastman Christensen Company · Inventors: Jurgens, Rainer; Hense, Ulrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A deep-borehole drilling device comprising a drive unit such as a downhole motor and a driven unit such as a generator in which a drive transmission coupling is provided in the form of a contact-free magnetic coupling. The magnetic coupling may be a permanent magnet coupling with the magnets arranged coaxially and is preferably a can-tube coupling comprising an outer magnet carrier and a can-tube disposed coaxially within said outer magnet carrier.
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
- Granted October 24, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 24, 2006.
- 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.