Core machine
CA 2257377 C · Owner: Bartette, Pascal · Inventors: Bartette, Pascal
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Core machine intended particularly to the oil prospection field comprising a , core crown (2), an external tube (3) for the rotational driving of the core crown (2), and an internal tube (4) having a free front end element (7) intended to receive a core (5), and a revolution surface (8) of the free end element (7), on the crown side (2), arranged to cooperate with an internal surface (9) thereof, or optionally of the external tube (3) so as to adjust , between the two a predetermined passage for the core drilling fluid the free , end element (7) being mounted in the core drilling machine (1) so as to slide coaxially on an extremity section (13) of the internal tube (4) between a , …
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 June 3, 1997 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 3, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 2019.
- 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.