Perforating type lockout tool
CA 2087673 C · Owner: Halliburton Energy Services, Inc. · Inventors: Meaders, Michael Wade; Dickson, Rennie L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tubing retrievable safety valve, lockout tool and their method of use are disclosed for locking the valve open permanently and provide access to control line pressure by perforating a piston in the valve. The lockout tool comprises a track mandrel having a ramp slidably disposed beneath a punch that is adapted to penetrate the piston wall of the valve at a point adjacent to the control fluid annulus, thereby creating a protrusion adapted to lock the valve open and establishing fluid communication between the control fluid annulus and the valve bore.
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 January 20, 1993 and granted August 5, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2015.
- 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.