Expired Canadian patentCanada
Equipment for rod string, namely a drill string, having a coupling with a side light for insertion of a cable
CA 1287848 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 August 20, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 13, 1986
GrantedAugust 20, 1991
Term endedAugust 20, 2008
Patent numberCA 1287848 C
Classification (IPC)E21B29/04 +2 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.