Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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| Number | Title | Issue Date |
| 7431572 | Hydraulic oil well pumping installation A hydraulic oil well pumping installation includes a down hole pump positioned down a well, the down hole pump including a master cylinder and at least one slave cylinder in axial alignment with the master cylinder. A master piston is positioned in the master cylind... | 10/07/2008 |
| 7351044 | Multi-stage piston type compressor In order to achieve a high level of impermeability with a low closing force for the sealing elements of a multistage piston compressor, the overflow channel (19) in the valve piston (9) opens into at least two passages (26, 27) and the sealing p... | 04/01/2008 |
| 7246551 | Liquid handling device with surface features at a seal A sample handling tool includes a body having at least one plunger associated with a channel and arranged for axial movement within the channel. A seal is provided in the channel and sealingly engaged with a contact surface. The contact surface may include a surface... | 07/24/2007 |
| 7237432 | Vane pump, method for adjusting pump flow rate of vane pump and fuel vapor leakage check module having vane pump A rotor includes a plurality of vanes and is connected to a rotatable shaft of a motor arrangement. A casing includes a pump chamber and elongated holes. The pump chamber receives the rotor in such a manner that the rotor is eccentric to the pump chamber. Each elong... | 07/03/2007 |
| 7234344 | Vane pump and fuel vapor leakage check module having the same A vane pump includes a motor arrangement, a rotor, a casing and bolts. The motor arrangement includes a mount. The rotor includes vanes and is rotated by the motor arrangement. The casing has opposed first and second end surfaces and makes flat surface contact with ... | 06/26/2007 |
| 7223080 | Double-acting, high pressure cryogenic pump A double-acting, reciprocating piston, high discharge pressure, cryogenic fluid pump having a unique blow-by venting system. In two different embodiments, a double-acting piston has two pair of piston heads and two sets of seals. In a first embodiment, a blow-by ven... | 05/29/2007 |
| 7184254 | Apparatus and method for controlling the maximum stroke for linear compressors An apparatus and method for controlling the maximum stroke of a linear compressor is provided. The shorting of the normal supply voltage of a compressor to ground is used to detect overstroking. A plurality of transistors are electrically coupled to the control circ... | 02/27/2007 |
| 7108068 | Floating plate back pressure valve assembly A back pressure valve assembly for use in a well casing string. The valve assembly comprises a housing with a stationary and a floating plate therein. The floating plate is moveable between an open position spaced from the stationary plate and a closed position enga... | 09/19/2006 |
| 7083395 | Pump system for pumping liquefied gases Under one aspect of the present invention, a liquefied gas pump assembly is coupleable to a source of liquefied gas. A cooling assembly is positioned generally adjacent to a pump module. The cooling assembly has a converging pump-head-receiving aperture, a fluid inl... | 08/01/2006 |
| 7029249 | Electronic micro-pump A micropump provided with a cylindrical body (1) containing a measuring chamber (10) defined by a piston (2) and communicating firstly with a tank via an inlet orifice (10a) provided with an inlet valve, and secondly with the outsi... | 04/18/2006 |
| 6932584 | Infusion device and driving mechanism and process for same with actuator for multiple infusion uses A drive mechanism for delivery of infusion medium a coil capable of being electrically activated to provide an electromagnetic field. The coil surrounds a piston channel extending in an axial direction. An armature is located adjacent the coil, on one side of the ax... | 08/23/2005 |
| 6716006 | Telescopic dual movement pump A telescopic dual movement pump has a nozzle assembly, a central tube connected to the nozzle assembly, a first tube enclosing the central tube and slidable relative to the central tube and a second tube enclosing the first tube and slidable to the first tube. The c... | 04/06/2004 |
| 6602060 | Compressor employing piston-ring check valves A reciprocating compressor (26) includes two pistons (56 and 58) driven in opposite directions in a piston chamber (54). As a piston is driven in the downstream, compression-stroke direction, pressure causes a piston ring (64 or 66) that seals against the... | 08/05/2003 |
| 6592338 | Rotating compressor A vapor-compression distiller includes a rotary heat exchanger. A reciprocating compressor (26) maintains a pressure difference between the compressor's evaporation chambers (46) and its condensation chambers (44). The compressor is assembled in a common ... | 07/15/2003 |
| 6328536 | Reciprocating low pressure ratio compressor A reciprocating compressor capable of producing a steady-state, continuous, non-pulsing outflow at volumes less than 25 gallons per hour. The compressor utilizes at least two pistons driven in a near axial manner with any lateral forces imparted to the co... | 12/11/2001 |
| 6190142 | Manual air pumps having selectable high pressure and high pressure modes A manual air pump includes an outer tube and an inner tube coaxially mounted in the outer tube. An inner chamber is defined in the inner tube. An outer chamber is defined between the outer tube and the inner tube. A head is coupled to first ends of the in... | 02/20/2001 |
| 6024540 | Pump for pumping through a variable volume plunger chamber having a pair of plungers disposed in a stepped cylinder with a slide valve A pump for pumping through a variable plunger chamber having a pair of plungers disposed in a stepped cylinder with a slide valve includes two plungers of different diameters, united to each other. As they move within a stepped cylinder, the plungers form... | 02/15/2000 |
| 6015270 | Linear compressor or pump with integral motor A two stage compressor or pump with integral electronically controlled multiphase linear motor incorporates a cup shaped moving piston as a stator. The linear motor body has an intake head with valve fitted at the end adjacent to the closed end of the cup... | 01/18/2000 |
| 5997256 | Dual stage, dual mode air pump The dual stage, dual mode air pump is selectively operable in a low pressure, high volume mode or a high pressure, low volume mode. It includes a pump head, an outer tube that is engaged to the pump head, an inner tube that is engaged to the pump head and... | 12/07/1999 |
| 5873705 | Tire pump A tire pump includes a head portion with a tubular portion extending therefrom and a main passage is defined through the head portion and communicates with the tubular portion, a connecting member slidably mounted to the tubular portion and having at leas... | 02/23/1999 |
| 5676529 | Compact manual air pump having selectable high volume and high pressure modes A pump comprises a pair of coaxial pistons, one slidably positioned in the other for simultaneous compression causing oppositely directed air flow, a passage having a valve for permitting air flow from one such piston to enter the other such piston for in... | 10/14/1997 |
| 5664560 | Gas mixing apparatus for a ventilator The gas mixing apparatus provides the components of a breathing gas for mixing at approximately ambient atmospheric pressure, and regulates the pressure of a selected gas to approximately ambient atmospheric pressure for mixing with air at ambient atmosph... | 09/09/1997 |
| 5613837 | Air compressor inlet and outlet valve arrangement An air compressor includes a suction space, a compression space and a discharge space that are aligned with one another. The compressor also includes one-way valves that function as a suction valve and a discharging valve. The open areas of the suction va... | 03/25/1997 |
| 5577896 | Pump An object of the present invention is to provide a pump which suppresses a decrease in the volumetric efficiency of the pump to a great extent even in case that the kinematic viscosity of a fluid is high with a compact structure of the pump itself. The pr... | 11/26/1996 |
| 5575627 | High and low pressure two stage pump and pumping method A pump includes a high pressure portion and a low pressure portion. During low pressure, high volume operation, pressure produced in the high pressure portion of the pump is applied to drive a large area piston in the low pressure portion of the pump. Onc... | 11/19/1996 |
| 5575626 | Cryogenic pump A cryogenic pump is disclosed for pumping liquified gas from one container to another container or a point of use. The pump comprises a series of chambers and coupling valves for progressively pumping a liquified gas from an inlet end located within and a... | 11/19/1996 |
| 5531221 | Double and single acting piston ventilators The piston ventilators include a double acting reciprocating piston, in which the piston motion delivering breathing gas to a patient receiving assistance from the ventilator simultaneously draws in breathing gas from a source of breathing gas, and a sing... | 07/02/1996 |
| 5511955 | Cryogenic pump A cryogenic pump capable of operating with a sub-zero net positive suction head includes a reciprocating piston positioned in a cylindrical housing for dividing the interior of the housing into a supercharger chamber and an evacuation chamber on opposite ... | 04/30/1996 |
| 5494410 | Manually operable vacuum pump A manually operable vacuum pump having a housing including first and second pump chambers whose volume is altered by movement of a displaceable piston which is moved by means of a piston rod attached thereto and fed through one of the first and second pum... | 02/27/1996 |
| 5492449 | Piston diaphragm pump for the delivery of liquids in doses A piston diaphragm pump operable for delivering doses of liquids such as surfactants, or wetting agents, for example, includes a pump piston that is reciprocally moveable within a pump tube that encloses a pump pressure chamber. The pump piston is electro... | 02/20/1996 |
| 5431229 | Method and apparatus for utilizing the pressure of a fluid column generated by a pump to assist in reciprocating the pump plunger The apparatus provides both a novel reciprocating pump for pumping fluid from a source by forming and moving a fluid column within a tubing and a method of using the pump. The pump, which is particularly suited for oil wells, uses the pressure generated b... | 07/11/1995 |
| 5209647 | Straight cylinder gas compressor with a reduced diameter compression chamber A straight cylinder, clamped between end headers, confines valve assemblies wholly therewithin, and has a cylindrical sleeve set within one half length of the cylinder to effect a staging, i.e., a two-step compression, of the admitted gas.... | 05/11/1993 |
| 4875833 | Pumping of high viscosity materials A vane pump in which the ports for passage of highly viscous material pumped are widely dimensioned and the clearances, in particular around the rod which carries the vane, are great. The invention applies to the pumping of materials of the type having a ... | 10/24/1989 |
| 4792289 | Reciprocating pump for cryogenic fluids In a reciprocating pump for cryogenic fluids comprising a pump cylinder in which a piston is oscillatingly displaceable in a sealed state, an inlet valve and an outlet valve, and an annular channel surrounding the pump cylinder on the outer side and formi... | 12/20/1988 |
| 4787823 | Electromagnetic linear motor and pump apparatus An electromagnetic linear motor having a variable length stroke and providing a substantially large force in both its power stroke and return stroke includes concentric inner and outer magnetic circuits arranged coaxially for movement relative to one anot... | 11/29/1988 |
| 4758131 | Apparatus for displacing high viscous substances An apparatus for displacing a high viscous substance, such as grease, which comprises a positive displacement-type pump. The chamber of the pump is in communication with a second chamber defined by a tubular sleeve that is slidably displaceable on the bod... | 07/19/1988 |
| 4750868 | Pump with continuous inflow and pulsating outflow A pump with a continuous inflow and a pulsating outflow comprises a first chamber and a second chamber with a passage between them and made at least partly from a flexible material. There is an inlet to the first chamber and an outlet from the second cham... | 06/14/1988 |
| 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 |
| 4735185 | Apparatus for feeding high-pressure fuel into engine cylinder for injection control A fuel injection control apparatus includes a booster apparatus, in which a cylinder chamber is divided into first and second fluid chambers by a piston. The operative area of the piston facing the first fluid chamber is sufficiently greater than that fac... | 04/05/1988 |
| 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 |
