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| Number | Title | Issue Date |
| 7341256 | Seal ring A seal ring which maintains a stable sealing performance over a long term is provided. In a first seal portion, linear contact portions which come into linear contact with the sidewall surface of an annular groove on the unsealed fluid side are continuously extended... | 03/11/2008 |
| 7165772 | Self-locking seal ring A self-locking seal ring is disclosed. The self-locking seal ring includes a ring body having a tab end segment on one end and a channel end segment on the opposite end. A lock tab is provided on the tab end segment, and a lock channel is provided on the channel end... | 01/23/2007 |
| 7121552 | Piston ring A piston ring includes a lateral surface which covers a circumferential surface of a piston and support segments with retaining surfaces which engage with the top and bottom of the piston. A piston ring joint allows the piston ring to be elastically deformed in the ... | 10/17/2006 |
| 7066719 | Bore and shaft assembly An exemplary bore for a shaft of a turbomachine includes a longitudinal axis extending generally from an inner end to an outer end of the bore, an outer seat disposed proximate to the outer end of the bore at an outer seat radius for an outer seal ring wherein the o... | 06/27/2006 |
| 6962343 | Seal ring A seal ring is provided, which is capable of maintaining a stable sealing performance for a long period, in which a cut portion is provided at one position in a circumferential direction of a seal ring, a convex portion is provided at a first cut end portion, a rece... | 11/08/2005 |
| 6904790 | System and method for ECM land erosion metrology A system and method for characterizing and measuring hydrodynamic grooves made by ECM processes is disclosed. The method includes a procedure for alignment of the work piece to the measurement apparatus as well as a technique for accurately reliably measuring the er... | 06/14/2005 |
| 6715767 | Angled gap compression rings with end relief An engine piston compression ring designed to reduce the negative effects of ring end butting and reduce blowby. The compression ring has a gap forming an angle with a longitudinal axis of the ring or with a radius drawn from the axis. A relieved portion is provided... | 04/06/2004 |
| 6120035 | Mating ring seal members with beveled mitered interface An end cap with a inwardly flanged bevel tapered seal utilized on sample cylinders for pipeline applications that provides a better means for sealing the sample cylinder. The present invention specifically relates to mating ring seal members having a beve... | 09/19/2000 |
| 5934680 | Split resin seal ring with chamfered end connection structures A composite step-cut type synthetic resin seal ring having a pair of abutments provided at one circumferential point of the ring body and spaced from each other. Each abutment has end face and comprises a protrusion and a shoulder provided adjacent to eac... | 08/10/1999 |
| 5934685 | Step lock piston ring insert A piston ring seal having stepped ends with feathered edges to minimize ring expander wear in high pressure hydraulic applications. The ring seal is circumferential and comprises a resilient material surrounding a longitudinal axis having width extending ... | 08/10/1999 |
| 5564699 | Side and gap sealed oil ring An oil control ring assembly having a sealing ring and a scraping is disposed within a groove in a piston. The scraping ring assembly has a scraping end portion and spaced apart ends defining a gap. The sealing ring has a sealing end portion and mated spa... | 10/15/1996 |
| 5372488 | Oil well pump with radially expandable interlocking seal ring Improvements in a downhole submerged pump assembly having a plunger formed of a cast or machined cylindrical member includes seal ring grooves capable of receiving flat metallic seal rings formed of a plurality of segments which are interlocked in a manne... | 12/13/1994 |
| 5253878 | Compression ring for internal-combustion engines A compression ring for an internal-combustion engine includes an outer circumferential surface and a lower circumferential surface which define a lower outer circumferential corner, a radially extending first butt end face having a circumferentially proje... | 10/19/1993 |
| 4575107 | Piston rings for internal combustion engine A piston for a reciprocating internal combustion engine includes at least one pressure ring installed in an outer surface of the piston main body adjacent to the piston head. The pressure ring has a double-angle butt end construction comprising an outer c... | 03/11/1986 |
| 4533149 | Split seal ring with interlocking cut A seal ring for controlling fluid flow is provided with an interlocking cut allowing the seal ring to be latched into a continuous ring after being opened to allow positioning in an accompanying annular groove.... | 08/06/1985 |
| 4449721 | Split piston ring having stepped ends A piston ring working in a cylinder and receiving a higher pressure on one axial side thereof than one the other and having axially overlapping stepped ends, wherein a circumferentially extending resilient lip is provided on one of the stepped ends of the... | 05/22/1984 |
| 4361337 | Piston ring with tongue and groove joint A piston ring having its ends shaped to form a tongue and groove joint disposed at an angle of about 45° with respect to the cylinder contact surface, the tongue having a hook-shaped structure receivable in a slot in the base of the groove of the other e... | 11/30/1982 |
| 4251083 | Piston ring with tongue and groove joint A piston ring having its ends shaped to form a tongue and groove joint.... | 02/17/1981 |
| 4138125 | Piston ring with expansive force responsive to pressure The lower side of a piston ring slants downwardly in an outwardly direction at an acute angle to its upper side that is perpendicular to the wall of the piston. Spacings along the upper side and inward side of the ring permits conduction of gas for pressi... | 02/06/1979 |
