Friction grip for tubular goods
CA 2065394 C · Owner: Bouligny, Vernon J. Jr. · Inventors: Webre, Charles Michael; Bouligny, Vernon J. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The object of the invention is to provide a device for gripping threaded pipe and like tubular goods, about their outer diameter and for applying high torqueforces required for assemble and disassembly of threaded connections without, causing any surface deformation or structural deformation to said workpieces. The gripping device has an inflatable flexible liner (3) contained within rigid outer shell (5) Axial splines of internal sleeve (7) mate with corresponding splines of flexible liner (3), and distribute torque forces uniformly throughout flexible liner (3). Intro duction of fluid pressure into annular bladder (8) through port (6), causes the flex-, ible liner (3) to deform radial …
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
- Filed August 15, 1990 and granted January 21, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 15, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 15, 2012.
- 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.