Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 7357172 | Check valve with a spiral coil seal A seal for a check valve for a metal molding machine. The seal is provided by the combination of a peripheral groove in an outer surface of the check valve and a helically wound core in the groove. The helically wound coil is expandable into sealing engagement with ... | 04/15/2008 |
| 6631908 | Compression piston ring A compression piston ring includes a ring gap defined by facing first and second end faces; a ring back situated diametrically opposite the ring gap; first and fourth quadrants extending from opposite sides of the ring gap and second and third quadrants e... | 10/14/2003 |
| 6315299 | Apparatus and method of forming a tension resistant O-ring A method of forming a tension resistant O-ring is formed by extruding a length of precured elastomer with a coextensive central aperture; longitudinally dividing the elastomer; winding a strand of nonelastic synthetic material to form an endless ring havi... | 11/13/2001 |
| 6283070 | Apparatus and method for sealing internal combustion engines An improved sealing means for internal combustion engines comprising a combination of a metal primary sealing ring positioned substantially within a groove on the piston, and a compliant secondary sealing ring positioned in the groove behind the primary c... | 09/04/2001 |
| 6105970 | Seal arrangement A sealing arrangement for establishing a seal between two machine elements, such as a rod or piston undergoing axial motion within a housing. A rod or piston seal is arranged in a groove of the second machine element, which typically is the housing of the... | 08/22/2000 |
| 6068459 | Tip seal for scroll-type vacuum pump A tip seal for use in a scroll-type vacuum pump includes a seal element and an energizer element affixed to the seal element. The scroll-type vacuum pump includes first and second scroll blades that are nested together to define one or more interblade poc... | 05/30/2000 |
| 4576381 | Spiral piston ring with tapered ends and recesses A spiral piston ring made of self-lubricating material and having at least two complete convolutions and having a gradual and continuous taper except for the terminal portions thereof which taper at a steeper angle than the gradual and continuous taper, a... | 03/18/1986 |
| 4333661 | Expanding helical seal for pistons and the like A seal 34 formed of a resilient helical coil 42 which is stressed at its small end to form a stationary seal in its groove 36 and stressed to unwind at its large end 44 to form a dynamic seal against the cylinder wall 22. A helical coil 56 of low friction... | 06/08/1982 |
| 4048908 | Pistons A piston for use in a hydraulic or other fluid operated device having sealing means intended to prevent the passage of working fluid between the piston and cylinder in which it moves consisting of the combination of at least one O ring or other sealing de... | 09/20/1977 |
