Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Terry J. Koltermann0
Redd H. Smith0
Date of Patent
March 29, 2011
Patent Application Number
11178120
Date Filed
July 8, 2005
Patent Primary Examiner
Patent abstract
A subterranean drill tool has a seal gland formed between a rotating and a static surface. An annular elastomeric seal is located in the gland in engagement with each of the surfaces. A property gradient is formed in at least part of the elastomeric material. The property gradient defines a property that changes from a first level at the surface to a second level in the interior of the seal. The elastomeric material within the property gradient has the same chemical composition as the rest of the seal.
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