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:
Feb. 18, 1997
Filed:
Aug. 11, 1995
William F Keyser, Jr, Willis, TX (US);
Merle L Bell, New Waverly, TX (US);
Ronney P Edwards, Richardson, TX (US);
Weston W Woods, Houston, TX (US);
Greene, Tweed of Delaware, Inc., Wilmington, DE (US);
Abstract
An annular expandable seal assembly is disclosed for being packed between inner and outer cylindrical walls. The seal assembly has an annular expandable elastomeric seal element, an annular non-elastomeric anti-extrusion element, and an arcual non-elastomeric anti-extrusion bridge element. The seal element has opposing inner and outer axial surfaces and opposing first and second radial surfaces. The anti-extrusion element is coaxially positioned at the first radial surface and has a toroidal gap. The bridge element is positioned between the seal element and the anti-extrusion element in alignment with the toroidal gap. The seal assembly is set by being expanded so that the inner and outer surfaces respectively sealingly contact the inner wall and the outer wall, the toroidal gap expands, and the anti-extrusion element and the bridge element contact the outer wall. When pressure is applied to the set seal assembly adjacent the second radial surface, the anti-extrusion element and the bridge element together function as a backup to prevent seal element extrusion at the outer wall.