Dual string elevators
CA 1138418 A · Owner: Coyle, William E. Sr. · Inventors: Coyle, William E. Sr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A dual string elevator having a body with a pair of tapered bowls extending vertically therethrough, lifting projections extending outward from the body in positions aligned with the bowls to prevent bending of a string supported in one of the bowls, a set of gripping slips for each bowl an, actuator for each set of gripping slips each actuator being mounted in a, recess in the body aligned with and spaced outward from the bowls and means for connecting the actuators to their set of gripping slips whereby the slips are moved out of the bowls and lowered into the bowls into pipe gripping position responsive to the movement of the actuators.
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 December 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
- 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.