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Class Information
Number: 277/498
Name: Seal for a joint or juncture > Seal between relatively movable parts (i.e., dynamic seal) > Piston ring or piston ring expander or seat therefor > Split single piece piston ring having other than opposed asymmetrical mirrored ends
Description: Piston ring wherein the piston ring is an annulus including only a gap providing opposed ends that are of substantially dissimilar shape even when considering opposite orientation.

Sub-classes under this class:

Class Number Class Name Patents
277/499 Arcuate or beveled mating surfaces 17

Patents under this class:

Patent Number Title Of Patent Date Issued
7758052 Seal assembly Jul. 20, 2010
7510195 High temperature and high pressure compressor piston ring Mar. 31, 2009
7121552 Piston ring Oct. 17, 2006
6997460 Piston ring for piston engines Feb. 14, 2006
6726218 Compression piston ring for use in internal combustion engine Apr. 27, 2004
6631908 Compression piston ring Oct. 14, 2003
6176492 Piston ring for shock absorber Jan. 23, 2001
5988649 Fractured seal ring Nov. 23, 1999
5934685 Step lock piston ring insert Aug. 10, 1999
5618048 Piston ring seal having angled ends Apr. 8, 1997
4251083 Piston ring with tongue and groove joint Feb. 17, 1981

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