Drilling tool with elastomer seal having graded properties

Details Drilling tool with elastomer seal having graded properties Drilling tool with elastomer seal having graded properties

2011-03-29

2011-03-29

Pickard, Alison K (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

Reexamination Certificate

active

07914006

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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Radiation Technology for Polymers, by Jiri George Drobny, CRC Press, pp. 1-4, 27-29, 63-70, 77-80.

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