Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 7014069 | Dosage pump A dosage pump which includes a pump body and a control means with rest and distribution positions. The control means includes a dosing chamber, a return spring, and a member to ensure friction braking of the sliding movement of the actuating members of the pump.... | 03/21/2006 |
| 6938803 | Non-leaking non-dripping liquid jet pump A liquid jetting pump of the present invention is constructed such that an intra container liquid is sucked into a cylinder 3 through a suction valve 9 by moving a vertically movable member 4 up and down, and the intra cylinder liquid is jetted ... | 09/06/2005 |
| 6934996 | System for actuating a gas damper A gas-filled cylinder, with two concentric cylindrical bodies or tubes that determine an intermediate gas passage chamber and are separated by a shaft cap and a valve cap that allow the passage of gas towards the interior, in which a piston moves and forms two inter... | 08/30/2005 |
| 6931693 | Damper mechanism A damper mechanism installed on an opening and closing device that has an arcuate plunger with the same radius of curvature of the cylinder it slidably mates with. A torsion coil spring causes the sliding action of the plunger into the cylinder in one direction.... | 08/23/2005 |
| 5605446 | High viscosity material pump having valved priming piston A reciprocable liquid pump having a priming cylinder affixed beneath the lower valve housing, and a priming piston rod affixed to the lower end of the pump piston valve assembly. A priming piston and priming valve are affixed to the lower end of the primi... | 02/25/1997 |
| 5358389 | Two-stage compression vacuum pump having valved piston and power limiting valve This invention relates to a vacuum pump. The pump includes a pump housing (10) having upper and lower cylindrical, partly liquid filled, compression chambers (11 and 12 respectively) which are separated from each other and in which an upper and a lower pa... | 10/25/1994 |
| 5188519 | Saturated fluid pumping apparatus A reciprocating pump which substantially eliminates cavitation problems without imposing capacity and flow limitations to maintain a net positive suction head. The pump comprises a cylinder having a liquid inlet and a liquid outlet, a piston reciprocably ... | 02/23/1993 |
| 5147188 | Priming piston pump piston check valve A reciprocating priming piston pump is provided with a piston check valve which provides improved performance by minimizing the pressure drop there through. A dog-bone shaped seat is slideably located inside a piston which in turn slides inside the cylind... | 09/15/1992 |
| 4740141 | Plunger with composite retention valve A pump is disclosed comprising a piston plunger with a valve disposed in it. The ratio of the flow area on either side of the valve is optimized.... | 04/26/1988 |
| 4708597 | Plunger with simple retention valve A fluid pump is disclosed having a plunger reciprocating within a working cylinder and a standing intake retention valve. The plunger comprises a stem having affixed to it a plug and a stop, a body being slidably engaged to the cylinder an located on the ... | 11/24/1987 |
| 4595346 | Waterless urinal pumps Two flanged sleeves, closed and valved at one end, and a bonnet with two gudgeons act as a cylinder-piston mechanism for pumping. The upper sleeve is movable and spring-loaded, accepts and is filled with liquid. When the bonnet is depressed, through its g... | 06/17/1986 |
| 4591316 | Piston with simple retention valve A positive displacement pump particularly useful in pumping viscous fluids which may or may not contain gases, including water vapor, and/or suspended solids in which the actual flow equals the theoretical maximum flow through a check valve associated wit... | 05/27/1986 |
| 4591315 | Piston with composite retention valve A positive displacement pump particularly useful in pumping viscous fluids which may or may not contain gases, including water vapor, and/or suspended solids in which the actual flow equals the theoretical maximum flow through a check valve associated wit... | 05/27/1986 |
| 4377180 | Non-return valve for plastic injection molding A non-return valve for use in plastic injection molding is disclosed comprising an elongated body having a threaded end for connection to one end of a reciprocating feed screw. A first removable valve seat insert is received over a cylindrical portion on ... | 03/22/1983 |
| 4349044 | Non-return device at the screwhead of screw injection molding machines In a screw injection molding machine comprising a non-return device at the screwhead, said device comprising a pressure ring which is displaceable on the screwhead between front and rear abutments, is guided in the cylinder by its outer periphery and defi... | 09/14/1982 |
| 4332533 | Fluid pump A fluid pump with a standing valve above a traveling piston within a housing bore. The traveling piston is mounted on a rod which extends through the housing to a drive mechanism. The traveling piston is constructed so that on the downstroke fluid may pas... | 06/01/1982 |
| 4202251 | Generator for flow rate of pressurized fluid A power generator comprising: body means having three chambers separated from each other by fixed fluid-tight partitions and having a central bore. Shaft means are rotatably mounted in the central bore of the body means with at least one end of the shaft ... | 05/13/1980 |
