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:
May. 02, 1995
Filed:
Mar. 18, 1994
R Lee Colvard, Spring, TX (US);
Weatherford U.S., Inc., Houston, TX (US);
Abstract
The present invention, in one embodiment, has a valve body within which is mounted a stem support; a plunger with a stem which is movably mounted for movement in the stem support to move a rounded head of the plunger to sealingly contact a sealing surface within the valve body thereby preventing flow through the valve; a piston recess in the stem which receives and holds a top portion of a piston; the piston (or some part connected thereto or formed integrally thereof) held immobile by one or more holding devices (e.g. bars, plates, pins, rods, etc.) which, in one embodiment extend through the piston and into the stem support or into a piston housing and which are frangible, erodible, degradable or destroyable either by action of a hydrostatic head of fluid on a bottom surface of the piston or by chemical or thermal attack and degradation.