The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 1984
Filed:
Apr. 21, 1982
Michael E McMahan, Duncan, OK (US);
Halliburton Company, Duncan, OK (US);
Abstract
A recloseable auxiliary valve includes a cylindrical housing having a central flow passage disposed therethrough. A flapper valve is disposed in the housing and is movable between a closed position wherein the central flow passage is closed and an open position wherein the central flow passage is open. An operating mandrel is provided for operating the flapper valve upon telescoping movement of the mandrel relative to the housing. A releasable locking system is provided for locking the mandrel and the flapper valve in their open position. A time-delay system is provided to prevent premature telescopingly collapsing movement of the mandrel relative to the housing as the auxiliary valve is run into the well.