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. 14, 1992
Filed:
Nov. 15, 1990
Applicant:
Inventors:
John D Icenhower, Sulphur Springs, TX (US);
Stephen M Horvath, Sulphur Springs, TX (US);
Assignee:
M&FC Holding Company, Inc., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ; F16J / ; F16J / ;
U.S. Cl.
CPC ...
251214 ; 13724622 ; 251283 ; 277 / ; 277112 ; 277125 ; 277D / ;
Abstract
A valve stem sealing means comprising first and second seal assemblies, the first seal assembly being proximate a valve plug and comprising an expandable ring adapted to be expanded by pressure within the valve to effect a first seal around the valve stem, and the second seal assembly being nearer a free end of the valve stem and comprising a second expandable ring adapted to be expanded by contact with a selectively movable member to effect a second seal around the stem.