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Class Information
Number: 277/468
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 > Separate and other than metal
Description: Particular piston ring expander wherein the biasing means is distinct from the piston ring and made out of a material that differs from metal.










Patents under this class:

Patent Number Title Of Patent Date Issued
7762177 Hydraulic cylinder unit Jul. 27, 2010
7311182 Sealing and guiding packet Dec. 25, 2007
6517081 Machinery seal Feb. 11, 2003
6502826 Hydraulic cylinder piston seal Jan. 7, 2003
6340161 Machinery seal Jan. 22, 2002
6283070 Apparatus and method for sealing internal combustion engines Sep. 4, 2001
6206248 Dispensing piston for commodity container Mar. 27, 2001
6199868 Piston assembly with piston ring support and sealing member Mar. 13, 2001
6164659 Piston rod seal Dec. 26, 2000
5711206 Piston and cylinder assembly for minimizing water blow-by in an air compressor Jan. 27, 1998
5560278 Hydraulic cylinder with an electrical contacting and sealing ring Oct. 1, 1996
5490445 Ultra low device volume piston system Feb. 13, 1996
5474307 Piston ring employing elastomeric sealing member within the ring groove Dec. 12, 1995
5328177 Contaminant resistant piston seal with energized backup scrapers Jul. 12, 1994
5275422 Sealing assembly Jan. 4, 1994
5253877 Piston ring having tapered outwardly extending wiper Oct. 19, 1993
5197746 Substantially zero leakage path sealing assembly with expander void Mar. 30, 1993
5193821 Substantially zero leakage path sealing assembly with zero degree bias angle Mar. 16, 1993
5147094 Substantially zero leakage path sealing assembly with insulating member Sep. 15, 1992
5071142 Bi-directional substantially zero leakage path sealing assembly Dec. 10, 1991
5028055 Substantially zero leakage path sealing assembly with additional line to line ring Jul. 2, 1991
4917390 Hydraulic seal assembly Apr. 17, 1990
4889351 Hydraulic seal Dec. 26, 1989
4875405 Sealing device Oct. 24, 1989
4840379 Split sealing ring having a bias cut Jun. 20, 1989
4749202 Sealing and guide unit for pistons in general Jun. 7, 1988
4577874 Seal assembly Mar. 25, 1986
4566703 Seal assembly Jan. 28, 1986
4526386 Nested serpentine seal assembly Jul. 2, 1985
4496161 Radially extensible joint packing with O-ring Jan. 29, 1985
RE31171 Hydraulic piston rod seal Mar. 8, 1983
4362304 Packing arrangement for a floating piston Dec. 7, 1982
RE31005 Resilient plastic piston ring Aug. 3, 1982
4284280 Sealing for machine elements which move back and forth Aug. 18, 1981
4244280 Piston for a pneumatic cylinder Jan. 13, 1981
4239244 Hydraulic piston rod seal Dec. 16, 1980
4206930 Circumferentially compressed piston ring assembly and method Jun. 10, 1980
4204690 Sealing retaining ring assembly May. 27, 1980
4190259 Single apex two element fluid pressure seal assembly Feb. 26, 1980
4179131 Seal arrangements Dec. 18, 1979
4178000 Sealing provided between the walls of a cooled continuous mould and the head of a starter bar Dec. 11, 1979
4109924 Stepped joint piston ring Aug. 29, 1978
4101140 Peripherally grooved seal Jul. 18, 1978
4079951 Metal piston with annular flanges having synthetic overlay and annular seal Mar. 21, 1978
3999767 Piston ring system Dec. 28, 1976
3990712 Double-action compression type seal Nov. 9, 1976
3990711 Restrained elastomeric seal ring means Nov. 9, 1976
3942806 Sealing ring structure Mar. 9, 1976











 
 
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