Seal ring

Details Seal ring Seal ring

2005-08-16

2005-08-16

Wu, David W. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S494000, C524S495000, C524S543000

Reexamination Certificate

active

06930142

ABSTRACT:
A seal ring with a sliding surface, which is obtained by molding a molding powder or granulated powder of non-melt-moldable modified polytetrafluoroethylene containing 0.01 to 1% by weight of a perfluorovinylether unit represented by the formula (I):in-line-formulae description="In-line Formulae" end="lead"?—CF2—CF(—O—X)—  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein X represents a perfluoroalkyl group having 1 to 6 carbon atoms or a perfluoroalkoxyalkyl group having 2 to 9 carbon atoms, the modified polytetrafluoroethylene having a heat of crystallization of 18 to 25J/g measured by a differential scanning calorimeter.

REFERENCES:
patent: 5888424 (1999-03-01), Ebnesajjad et al.
patent: 6037402 (2000-03-01), Asano et al.
patent: 0 583 481 (1994-02-01), None
patent: 0583481 (1994-02-01), None
patent: 8-319391 (1996-12-01), None
patent: 9-324091 (1997-12-01), None
patent: 11-116623 (1999-04-01), None
International Search Report for PCT/JP01/02222 dated Apr. 24, 2001.
English Translation of International Preliminary Examination Report for PCT/JP01/02222 Dated Dec. 26, 2001.

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