Tubular element for use in a rotary drilling assembly
CA 1329193 C · Owner: Shell Canada Limited · Inventors: Zijsling, Djurre Hans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tubular drill string element such as a stabilizer or tool, joint, comprises an outer surface having in circumferential direction a ratchet profile. The ratchet profile is preferentially oriented such that it provides low resistance against right hand rotation but high resistance against left hand rotation of the drill string.
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 May 3, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2011.
- 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.