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Class Information
Number: 277/444
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 surface of dissimilar material or hardness > Surface coating, plating, or impregnation > Chromium
Description: Piston ring wherein the surface has chrome provided as a layer on the surface or chemically infused near the surface.

Patents under this class:

Patent Number Title Of Patent Date Issued
8652620 Sliding element in an internal combustion engine, in particular a piston ring Feb. 18, 2014
8356820 Piston ring Jan. 22, 2013
8235393 Piston ring Aug. 7, 2012
8201831 Sliding element, in particular piston ring, method for manufacturing a sliding element, sliding system and coating for a sliding element Jun. 19, 2012
8123227 Sliding member Feb. 28, 2012
7871078 Piston ring and method for the production thereof Jan. 18, 2011
7267344 Piston ring with a PVD coating Sep. 11, 2007
7073611 Ion-beam assisted deposition of inorganic coatings for elastomeric seal wear resistance improvement Jul. 11, 2006
6726216 Piston ring with oxide-nitride composite layer Apr. 27, 2004
6703145 Process for electrolytic coating of a substrate and product produced Mar. 9, 2004
6631907 Nitride-plated piston ring for internal combustion engines Oct. 14, 2003
6494461 Sliding member Dec. 17, 2002
6485027 Surface heat treatment of piston rings Nov. 26, 2002
6325385 Piston ring Dec. 4, 2001
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
6161837 Piston ring with hybrid face coating Dec. 19, 2000
6149162 Sliding member Nov. 21, 2000
6142481 Piston ring Nov. 7, 2000
6139022 Piston ring Oct. 31, 2000
6139984 Sliding member Oct. 31, 2000
6060182 Hard coating material, sliding member covered with hard coating material and manufacturing method thereof May. 9, 2000
6054225 Composite chromium plating film and sliding member covered thereof Apr. 25, 2000
6013380 Composite chromium plating film and sliding member covered thereof Jan. 11, 2000
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
5718437 Combined oil ring with spacer/expander having Cr.sub.2 N coating thereon Feb. 17, 1998
5601293 Sliding member with hard ternery film Feb. 11, 1997
5582414 Sliding member and method for manufacturing the same Dec. 10, 1996
5039116 Composite oil-ring Aug. 13, 1991
4941669 Fiber-reinforced piston ring for internal combustion engine Jul. 17, 1990
4876158 Piston ring having a wear resistant surface layer Oct. 24, 1989
4817578 Internal combustion engine Apr. 4, 1989
4612260 Piston ring member Sep. 16, 1986
4548416 Oil-ring including two rail rings and an expander-spacer ring which bites into the rail ring Oct. 22, 1985
4420543 Bearing member of an internal combustion engine, having a flame sprayed surface Dec. 13, 1983
4359230 Piston ring with wear resistant coating Nov. 16, 1982
4344634 Compression rings Aug. 17, 1982
4323257 Piston ring with a Cr-C-Fe inlaid ring in its outer surface, and a method of making it Apr. 6, 1982
4307890 Piston ring with chrome-filled groove Dec. 29, 1981
4233072 Sliding member having wear- and scuff-resistant coating on its surface Nov. 11, 1980
4214762 Rolled metal piston ring Jul. 29, 1980
4161321 Piston ring and method of manufacture Jul. 17, 1979
RE29899 Chrome insert ring Feb. 6, 1979
4106782 Ceramic coated piston rings Aug. 15, 1978
4079949 Integral spring piston ring Mar. 21, 1978
4077637 Ceramic coated piston rings Mar. 7, 1978
4030767 Chrome insert ring Jun. 21, 1977
3944236 Piston ring Mar. 16, 1976
3938814 Bearing member having a wear resistant coating on its bearing face Feb. 17, 1976

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