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Class Information
Number: 277/459
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 > Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel
Description: Piston ring including an uncovered opening, incline, removed, or indented portion on an outer peripheral surface of the piston ring.










Sub-classes under this class:

Class Number Class Name Patents
277/460 Circumferential groove, channel, recess, or bevel 45
277/464 Circumferentially spaced ports 12
277/465 Circumferentially spaced slots, pockets, grooves, channels, recesses, or bevels 26


Patents under this class:

Patent Number Title Of Patent Date Issued
8662047 Handheld work apparatus Mar. 4, 2014
8561999 Sealing device and production method thereof Oct. 22, 2013
8371585 Oil wiper ring Feb. 12, 2013
8313104 Sealing device Nov. 20, 2012
7869737 Developer cartridge, developing device and image forming apparatus Jan. 11, 2011
7520538 Orbital tube welding purge adaptor Apr. 21, 2009
7429048 Piston ring with projection Sep. 30, 2008
7354045 Oil ring Apr. 8, 2008
7207571 Steel piston ring Apr. 24, 2007
7083170 Rod or piston primary seal Aug. 1, 2006
7044473 Piston and piston ring assembly May. 16, 2006
6962343 Seal ring Nov. 8, 2005
6793222 Oil scraper piston ring having circumferentially distributed recesses Sep. 21, 2004
6715767 Angled gap compression rings with end relief Apr. 6, 2004
6685193 Self lubricating, non-sealing piston ring for an internal combustion fastener driving tool Feb. 3, 2004
6543784 Wear compensating plunger-and-barrel seal for hydraulic fuel injectors Apr. 8, 2003
6517081 Machinery seal Feb. 11, 2003
6439578 Sealing ring combination Aug. 27, 2002
6367808 Sealing ring for a dry running piston rod Apr. 9, 2002
6341782 Lubricated seals having micropores Jan. 29, 2002
6340161 Machinery seal Jan. 22, 2002
6189893 Piston ring Feb. 20, 2001
6158744 Seal arrangement providing a seal between a bore and a rod movable in the bore Dec. 12, 2000
5794941 Piston ring assembly Aug. 18, 1998
4785922 Gun recoil mechanism Nov. 22, 1988
4776261 Reciprocating engine piston seal Oct. 11, 1988
4431200 Back-up ring with slitted, folded portion for packing of hydraulic apparatus Feb. 14, 1984











 
 
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