Tubing drain valve
CA 1233744 A · Owner: Soderberg Research & Development, Inc. · Inventors: Soderberg, Paul B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
24-, Abstract of the Disclosure, The present invention discloses a tubing drain valve suitable for use in a borehole and a method for operating the disclosed valve. This device is particularly useful in a production pipe string where it provides a convenient apparatus and method for draining production fluid from the string in order to facilitate a variety of activities. More particularly, the present invention relates to a tubing drain valve actuated to its open position by a force developed across the working surfaces of a movable piston by the pressure in the interior of the production string and actuated to its closed position by a mechanical device. Preferably the tubing drain, valve …
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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 March 8, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 8, 2005.
- 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.