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Class Information
Number: 277/447
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 > Floating piston ring
Description: Piston ring including relative movement to the seat.

Sub-classes under this class:

Class Number Class Name Patents
277/448 Material other than metal 25

Patents under this class:

Patent Number Title Of Patent Date Issued
7815195 Sealing ring and sealing ring arrangement Oct. 19, 2010
7793941 Ring seal with inner lip Sep. 14, 2010
6843481 Fluid-moving device with a clearance seal Jan. 18, 2005
6616426 Airlift piston mechanism Sep. 9, 2003
6575472 System for sealing relatively movable elements Jun. 10, 2003
6367805 Stripping arrangement Apr. 9, 2002
6347575 Low emission piston and ring for internal combustion engine Feb. 19, 2002
6340160 System for sealing relatively movable elements Jan. 22, 2002
6270081 Combination of piston ring for use in internal combustion engine Aug. 7, 2001
6213474 Piston ring and combination of compression rings Apr. 10, 2001
6138923 Injector Oct. 31, 2000
5964467 Oil control ring of two piece type for internal combustion engine Oct. 12, 1999
5253877 Piston ring having tapered outwardly extending wiper Oct. 19, 1993
4681326 Gas lubricated piston ring assembly Jul. 21, 1987
4540185 Gas-lubricated seal for sealing between a piston and a cylinder wall Sep. 10, 1985
4477090 Piston ring assembly for hydraulic mechanisms, particularly such mechanisms for very high operating pressures Oct. 16, 1984
4455028 Sealing device with radially slitted metal washers for hydraulic piston mechanisms Jun. 19, 1984
4447062 Sealing arrangement for fluid flow engines May. 8, 1984
4438937 Piston ring Mar. 27, 1984
4411436 Spring loaded piston seal assembly Oct. 25, 1983
4350082 Pump piston having ring lubrication means Sep. 21, 1982
4313368 Reciprocating piston Feb. 2, 1982
4289264 Uniform load piston ring Sep. 15, 1981

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