Expired Canadian patentCanada
Wireline cutting coupling for well drilling and logging, for extraction and for downhole operations
CA 1301641 C · Owner: Institut Francais Du Petrole · Inventors: Wittrisch, Christian
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordRead 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 May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledJune 13, 1986
GrantedMay 26, 1992
Term endedMay 26, 2009
Patent numberCA 1301641 C
Classification (IPC)E21B29/04 +1 more
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.