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:
Mar. 25, 2003
Filed:
Oct. 28, 1999
Zhigang Fang, The Woodlands, TX (US);
Chris Cawthorne, The Woodlands, TX (US);
Nephi M. Mourik, The Woodlands, TX (US);
Sujian Huang, The Woodlands, TX (US);
Smith International, Inc., Houston, TX (US);
Abstract
Seals of this invention comprise an annular elastomeric ring-shaped body having a dynamic surface disposed along a first body portion, the dynamic surface comprising at least two surface elements that project outwardly therefrom to provide multiple barriers to fluid and debris migration thereacross when placed into contact with a rock bit rotary dynamic surface. The seal dynamic surface includes a recessed portion disposed between the surface elements, and a static seal surface disposed along a second body portion. At least one of the surface elements includes a wear surface that is formed from a material that is more wear resistant than materials that are used to form a remaining portion of the seal. A preferred wear surface is one formed from a composite material comprising a fabric of nonelastomeric polymeric material that is bonded together with an elastomeric material. Seals of this invention provide improved properties of both wear resistance and sealability when compared to conventional seals having a single dynamic seal surface.