Shrouded face seal and components thereof

Details Shrouded face seal and components thereof Shrouded face seal and components thereof

2005-11-03

2010-11-23

Will, Thomas B (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

C277S370000, C277S375000

Reexamination Certificate

active

07837199

ABSTRACT:
A face seal includes a seal seat and a seal element carried by a seal housing. The seal element cooperates with the seal seat to establish a seal. The housing includes a support for the seal element and a shroud for effecting a gradual transition between a normal condition and a deteriorated condition. The shroud may have a tip whose properties differ in lubricity, hardness or abradability relative to other portions of the seal housing.

REFERENCES:
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patent: 2592728 (1952-04-01), Payne
patent: 3024048 (1962-03-01), Kobert
patent: 3784213 (1974-01-01), Voitik
patent: 3841642 (1974-10-01), Kirker, Jr.
patent: 4063741 (1977-12-01), Kerr
patent: 4294453 (1981-10-01), Inouye et al.
patent: 4600318 (1986-07-01), Miller
patent: 4768790 (1988-09-01), Netzel et al.
patent: 6132168 (2000-10-01), Kovaleski et al.
patent: 6213472 (2001-04-01), Bondarenko et al.
patent: 6425583 (2002-07-01), Muraki
Pratt & Whitney Gas Turbine Seminar vol. 1 pp. 15-585A and 15-606 through 15-612 (1990).
Pratt & Whitney “Prior Art” Carbon Element.

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