Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 5620314 | Hand-operated liquid pump with removable parts A hand-operated, portable, easily-manufactured liquid pump offering efficiency through advanced plunger design, ease of repairability, and enhanced versatility through use of a select group of inlet and outlet accessories. The pump preferably includes a c... | 04/15/1997 |
| 5509792 | Electromagnetically driven reciprocating pump with fluted piston A reciprocal type of pump structure wherein a piston has a linear function actuated by a pair of coils energized alternately and includes a plurality of tapered flutes. A check valve in an outlet of the structure which stretches to open said outlet under ... | 04/23/1996 |
| 5472323 | Movable magnet type pump A movable magnet type pump, wherein a magnet moving body having at least one axially magnetized permanent magnet and an axially extending through liquid passage is arranged so as to be slidable inside a liquid introducing chamber; a plurality of coils are... | 12/05/1995 |
| 5293809 | Method of limiting a contact force A force limiter for limiting the force with which two articles come into contact with each other, which force limiter comprises a control member (11) displaceable with respect to a holder (5), which member is pneumatically prestressed with a force which i... | 03/15/1994 |
| 5209564 | Vibrator A pneumatic vibrator is disclosed including a tubular housing having closed ends, an inlet port in the housing through which a fluid, such as air can flow into the housing, and a free-floating piston in the housing having two passageways through which the... | 05/11/1993 |
| 5197371 | Force limiter and ultrasonic device provided with a force limiter A force limiter for limiting the force between two articles getting into contact with each other, which force limiter comprises a control member (11) displaceable with respect to a holder (5), which member is pneumatically pre-stressed with a force which ... | 03/30/1993 |
| 5174728 | Variable capacity swash plate type compressor A variable capacity swash plate type refrigerant compressor having a plurality of pistons each including a cylindrical hollow main body reciprocated in a cylinder bore of a cylinder block, and an engaging portion engaged with a swash plate. The cylindrica... | 12/29/1992 |
| 5161822 | Tilt correction system The invention concerns a tilt correction system with at least one pair of cylinder and piston assemblies which are hydraulically operated. The extent of tilt correction is limited by grooves internal to the cylinders of the assemblies which short hydrauli... | 11/10/1992 |
| 5151015 | Compression device, particularly for the pressure filling of a container The device for the compression of a gas comprises a motor (1), a piston (2) adapted to be displaced linearly in a pump body, transmission means (T) between the motor (1) and the piston (2) adapted to convert the rotary motion generated by the motor (1) in... | 09/29/1992 |
| 4537564 | Pumping system for oil production A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger ... | 08/27/1985 |
| 4451212 | Pumping system for oil production A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger ... | 05/29/1984 |
| 4447047 | Cylinder structure A cylinder structure and method for rapidly evacuating a cylinder without contamination thereof. The structure comprises a hollow cylinder, a piston mounted in the cylinder for axial reciprocation, a hollow piston rod secured to the piston for movement th... | 05/08/1984 |
| 4413549 | Limit switch actuator for fluid cylinders An actuator mechanism for detecting the presence of the piston or other movable element of a fluid cylinder for reversing switch purposes and the like is disposed in the end cap of the cylinder and is engaged by the cushion spear on the piston to provide ... | 11/08/1983 |
| 4320624 | Master cylinder A master cylinder for actuating a hydraulic cylinder for a hydraulic brake or clutch. The master cylinder includes a cylinder body having a cylinder bore defined therein. The cylinder bore is in communication with an oil tank by way of a supply port and a... | 03/23/1982 |
