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Class Information
Number: 277/476
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 > Particular piston ring expander > Annular expander nested in annular groove of the piston ring > Inclined or beveled groove contacting expander having dissimilar contour
Description: Particular annular piston ring expander provides an annular surface having a profile other than a slanting or sloping surface of the annular recess of the piston ring.

Patents under this class:

Patent Number Title Of Patent Date Issued
6173960 Rod seal apparatus for cylinder assembly Jan. 16, 2001
6116204 Oil scraper piston ring Sep. 12, 2000
5964467 Oil control ring of two piece type for internal combustion engine Oct. 12, 1999
5295696 Combined oil ring Mar. 22, 1994
5028055 Substantially zero leakage path sealing assembly with additional line to line ring Jul. 2, 1991
4917390 Hydraulic seal assembly Apr. 17, 1990
4522412 Oil ring with coil expander Jun. 11, 1985
4045036 Piston oil control ring Aug. 30, 1977

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