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| Number | Title | Issue Date |
| 7044472 | Combined steel oil control ring A combined steel oil control ring is provided which has steel side rails and a steel spacer expander. The spacer expander includes ear portions for contacting the side rails. The ear portions are substantially equally spaced with respect to each other along the inte... | 05/16/2006 |
| 6161468 | Four-piece oil seal A four-piece oil seal is disclosed that includes a resilient expander spacer having an axial top edge, an axial bottom edge and an axial intermediate portion therebetween. The axial intermediate portion of the resilient expander spacer includes a pluralit... | 12/19/2000 |
| 5238255 | Oil ring assembly An oil ring assembly comprising a pair of split rails and a piston ring spacer/expander on which said rails are mounted. Each rail is provided with a radially inwardly extending protrusion that lies substantially entirely within the thickness of the rail.... | 08/24/1993 |
| 5129661 | Steel oil ring assembly A steel oil ring assembly having an upper rail, a lower rail and an annular space-expander embraced by the rails and having radially extending or axially extending corrugations. The spacer is split at one circumferential location to form abutting end port... | 07/14/1992 |
| 5088743 | Combined oil ring assembly A combined oil ring assembly consisting of a corrugated, annular expander having abutting ends and a pair of upper and lower side rails, the rails resting on the upper and lower sides of the expander and engaging a plurality of circumferentially spaced ea... | 02/18/1992 |
| 5087055 | Steel oil ring assembly A steel oil ring assembly having an upper rail, a lower rail and an annular space-expander embraced by the rails and having radially extending or axially extending corrugations. The spacer is split at one circumferential location to form abutting end port... | 02/11/1992 |
| 5064206 | Piston ring An oil control piston ring is described comprising a pair of axially spaced apart side rails, the side rails each having a radially outer periphery forming a rubbing face with a co-operating cylinder wall, an expander having portions which lie between the... | 11/12/1991 |
| 5042825 | Combined oil ring assembly A combined oil ring assembly including an expander and a pair of side rails. The expander is formed in the shape of a plurality of corrugations having a plurality of oil releasing bores and cut-out portions. The circumferential lengths of the oil releasin... | 08/27/1991 |
| 4798391 | Three-piece oil-ring with a slot A three-piece oil-ring comprises a pair of side rails and an expander disposed between the side rails. The expander extends in a circumferential direction and has waves in a radial direction. At both sides of radially inner portions of the expander side r... | 01/17/1989 |
| 4762329 | Spacer expander for piston rings A spacer expander adapted for use in an oil ring assembly of an internal combustion engine comprising a split annular shaped spring body containing a plurality of lugs extending axially from the body to bear on a single rail or double side rails, the body... | 08/09/1988 |
| 4722535 | Oil ring structure having reduced rigidity An oil-ring comprising a pair of side rails and an expander disposed between the side rails. The expander extends in a circumferential direction and has waves in a radial direction. At both sides of radially inner portions of the expander, side rail engag... | 02/02/1988 |
| 4659093 | Three-piece oil-ring with an inward protrusion A three-piece oil-ring with a pair of side rails and an expander disposed between the side rails. The expander extends in a circumferential direction and has waves in a radial direction. Flat portions are located at radially inner portions of the expander... | 04/21/1987 |
| 4606101 | Method of manufacturing a radially corrugated expander-spacer for a piston oil ring assembly Method of manufacturing a radially corrugated expander-spacer for a piston oil ring assembly, having inner and outer crowns alternately and successively laid, which can prevent its both terminal ends from nesting together during assembling of the piston o... | 08/19/1986 |
| 4572520 | Multi-component steel piston ring with rotation preventing rivet A piston ring for control of the oil on a cylinder wall that is comprised of thin upper and lower ring members disposed to contact the cylinder wall and an intermediate corrugated expander-spacer. The upper ring member has a headed rivet with the upper he... | 02/25/1986 |
| 4542907 | Corrugated expander for piston ring assembly The annular expander of a piston ring assembly with vertically extending notches each of which is formed on either side of a plurality of circumferentially spaced upstanding tabs projecting from the top and bottom edges of the expander. The tabs, which fo... | 09/24/1985 |
| 4407515 | Combined oil ring A combined oil ring comprising a steel spacer expander and two steel side rails is described, which has excellent wear resistance and can be used in, for example, an internal combustion engine. The spacer expander and the side rail have specific structure... | 10/04/1983 |
| 4235447 | Low friction oil control piston ring A low friction oil control piston ring for an internal combustion engine has a cylinder engaging outer surface of shallow wave-like configuration having a plurality of spaced cylinder engaging annular ridges smoothly blended with intermediate shallow vall... | 11/25/1980 |
| 4204688 | Oil control ring spacer-expander with improved slip latch In a parted corrugated spacer-expander for use in a piston oil control ring of the type which includes a circumferential series of alternating inner and outer crowns successively connected by radially diverging spring legs having oil drain openings formed... | 05/27/1980 |
| 4059278 | Piston ring spacer-expander with overlap-preventing expander joint In a parted corrugated spacer-expander for a piston oil control ring, an improved expander end joint for preventing installation of the expander should overlap occur between the expander ends in which the respective expander ends are each formed in a mult... | 11/22/1977 |
| 3934886 | Corrugated radial spacer expander for compound oil scraping rings A corrugated radial spacer expander to be combined with side rails to form a compound oil scraping ring for internal combustion engines. The spacer expander has an annular shape cut at a portion thereof to present two opposing ends and has a corrugation c... | 01/27/1976 |
