Seal between relatively movable parts (i.e., dynamic seal) > Piston ring or piston ring expander or seat therefor > Particular piston ring expander > Slotted or undulating circular band including inclined or axially facing seat for the piston ring > Patents

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Class Information
Number: 277/477
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 > Slotted or undulating circular band including inclined or axially facing seat for the piston ring
Description: Particular piston ring expander wherein the piston ring expander is a resilient annular band having openings therein or having a wavy or corrugated contour, and a radially extending surface intended to space, position, retain, or bias a separate and distinct piston ring.

Sub-classes under this class:

Class Number	Class Name	Patents
277/478	Axially spaced axially facing seats	9

Patents under this class:

Patent Number	Title Of Patent	Date Issued
7243596	Spacer expander	Jul. 17, 2007
6655697	Piston oil ring having land flanked by concave sidewalls	Dec. 2, 2003
5820131	Piston ring having wear coating consisting of Cr.sub.2 N or a mixture of Cr.sub.2 N and Cr	Oct. 13, 1998
5052698	Two-piece type oil ring assembly	Oct. 1, 1991
4629198	Oil scraper piston ring assembly	Dec. 16, 1986
4226430	Two-piece oil control ring	Oct. 7, 1980
4145060	Axially and radially clamping spreader ring for an oil scraping piston ring	Mar. 20, 1979
4111437	Oil control ring spacer-expander with improved slip latch	Sep. 5, 1978
4053164	Spacer-expander for a piston oil control ring	Oct. 11, 1977