Valve for use in well bores
CA 1265994 C · Owner: Weatherford-Petco, Inc. · Inventors: Mcclung, Guy L. Iii; Hassanzadeh, Hedayat H
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A dual purpose valve for use in well bore casings has a body (12) supporting a valve seat (18) a movable valve element, (24) axially movable to a guide (22) and having a closure means (28) adapted in one position to sealingly contact the seat (18) to act as a back flow preventer. The valve defines a passage for fluid flow of sufficient cross section that it can serve as an automatic fill valve for permitting well bore fluid to flow into a casing string. A releasable locking means (32) is inserted in or adapted for insertion in the valve body in a locking position, in which the locking means contacts the valve element (24) to prevent movement of the valve element towards the valve seat to …
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 February 20, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 20, 2007.
- 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.