Core cutter head
CA 2115543 C · Owner: Dekoster, Claude · Inventors: Dekoster, Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A. core bit, in particular for a reservoir evaluation coring, comprising :, - a body (5) which is rotatable around a rotation axis (6), - blades (8) provided onto the body (2) at least in front of this body, - several cutters (10) divided along each blade (8) and having each a cutting edge (12), the cutting edges (12) being circumscribed together within an imaginary envelope disposed around a core (4) to be taken, - nozzles (13) which supply a jet of coring liquid and which emerge at the face of the body (5) at least, one nozzle (13) having an outlet (15) deflecting the liquid jet substantially obliquely forwards with respect to the rotation axis (6) of the body away, from the core, …
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 August 28, 1992 and granted November 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.