Adjustable length drilling sub
CA 1210385 A · Owner: Dailey Petroleum Services Corp. · Inventors: Anders, Edward O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An adjustable length drilling sub is disclosed for placing in a drill string between stabilizers to allow the distance between the stabilizers to be changed while the drill string is in the well bore to adjust the rate the angle of the well bore from the vertical is changing. The sub includes an outer member and an inner member that extends into the outer member with an annular space between the members. Protrusions in the form of drive pins mounted in the wall of the outer member extend into the annular space to move into and out of engagement with cavities formed on the outer surface of the inner member. When the pins are in engagement with the cavities torque, in one direction and weight …
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 August 26, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 26, 2003.
- 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.