Patent Yard Sign in
Expired Canadian patentCanada

Dual string elevators

CA 1138418 A · Owner: Coyle, William E. Sr. · Inventors: Coyle, William E. Sr.

CIPO record

Overview

Drawings and full text

Its claims, description and drawings are in the Canadian Patents Database.

Open the CIPO record

Abstract 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.
FiledNovember 5, 1980
GrantedDecember 28, 1982
Term endedDecember 28, 1999
Patent numberCA 1138418 A
Classification (IPC)E21B19/00 +1 more

Timeline

Timeline From CIPO dates

1981198319851987198919911993199519971999Application filedNov 5, 1980Patent grantedDec 28, 1982Term endedDec 28, 1999

Sources & verification

Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.