Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7429047 | Piston ring assembly A piston ring assembly includes an upper ring, a lower ring and an expander disposed between the upper and lower rings. When assembled, the piston ring assembly is positioned with a groove of a piston. During down stroke of the piston, the upper and lower rings radi... | 09/30/2008 |
| 6454271 | Combined oil ring A combined oil ring is comprised of an oil ring and an expander. The cross section of the oil ring is a generally I-shape, and the outer circumferential surfaces of outer rail portions form sliding surfaces to make contact with the cylinder wall surface. ... | 09/24/2002 |
| 6267384 | Thin 3-piece oil ring An improved thin 3-piece oil ring 1 of an axial width not greater than 2 mm, is provided that has a corrugated spacer expander 2 of a circumferentially successive, substantially U-shaped configuration, and circular, upper and lower side rails 3, 4 holding... | 07/31/2001 |
| 6113107 | Self-lubricated and-adjusted piston ring This invention relates to piston compression ring assemblies, each of which consists of a main ring element and an auxiliary ring element. The assemblies can by themselves adjust the radial gaps between the assemblies and the liner, and the gaps between t... | 09/05/2000 |
| 5964467 | Oil control ring of two piece type for internal combustion engine The oil control ring 1 is provided to attach in an annular groove 10 formed in a piston 2 for internal combustion engine. The spacer expander 4 comprises a base 8, a plurality of supports 6 and a plurality of arms 7. The supports 6 and arms 7 are integral... | 10/12/1999 |
| 5014603 | Hydraulic actuator having frangible or deformable components A linear hydraulic actuator of small size having limited clearance between the inside of the cylindrical housing and the outside of the piston rod is provided with a deformable or frangible piston of an engineered plastic material which is sufficiently st... | 05/14/1991 |
| 4652000 | Sealing system for high pressure gas applications A high pressure sealing system is disposed between a housing and a reciprocating member. One version has a reciprocating plunger and in another version is a reciprocating piston associated with a free floating piston. In the one embodiment, the reciprocat... | 03/24/1987 |
| 4566703 | Seal assembly A two element, high and low pressure seal assembly to be used in a hydraulic or pneumatic sealing environment between two relatively movable machine parts, the seal assembly comprising a spring element, circular or rectangular in cross-section and made of... | 01/28/1986 |
| 4553564 | Valve A valve comprising a housing having an open-ended portion of circular internal cross-section, an inlet port and an outlet port, the ports being interconnected by a flow space. An obturator is located within the flow space and attached to a movable head su... | 11/19/1985 |
| 4210338 | Piston ring assembly A piston ring assembly for placement between a piston and a cylinder wall is provided. The assembly includes an annular expansion ring disposed around the piston, and an annular parted piston ring disposed around the expansion ring. A predetermined segmen... | 07/01/1980 |
