Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7329105 | Multi-directional pump A multi-directional pump is disclosed generally comprising a housing with inlet and outlet ports, a pumping device disposed therein, a first chamber in fluid communication with the inlet port, and a second chamber in fluid communication with the first chamber. The f... | 02/12/2008 |
| 7273355 | Compressor assembly with piston having multiple cross sections A compressor assembly having a piston with multiple cross sections. The compressor assembly, in one form thereof, includes a cylinder block defining a cavity. A piston is at least partially disposed in the cavity and reciprocates along a central axis of the cavity. ... | 09/25/2007 |
| 7175400 | Compressor assembly with reciprocating piston and vented cylinder A compressor assembly including a cylinder block defining first and second cavity portions. A central axis extends through first and second cavity portions. A compressible fluid respectively enters and exits the first cavity portion through an inlet and outlet. A pi... | 02/13/2007 |
| 6123516 | Vacuum pump A vacuum pump, comprising at least one pump chamber (7, 8, 23 to 26) and at least one chamber (3, 5, 27) adjoining the pump chamber. The vacuum pump is fitted with a gas ballast device to avoid damage being caused in the adjoining chambers by the gases be... | 09/26/2000 |
| 5482443 | Multistage vacuum pump A multistage vacuum pump is achieved by utilizing a single piston and cylinder assembly having opposite end portions with substantially equal diameters and an enlarged diameter central portion. One end of the cylinder is closed by a valve and a first stag... | 01/09/1996 |
| 5451145 | High pressure fluid pump transformer and method A high pressure fluid pumping transformer apparatus has a cylindrical transformer body surrounded by an outer pressure sleeve defining an annular working fluid chamber substantially surrounding the transformer body which receives fluid from an external so... | 09/19/1995 |
| 4954047 | Evacuation apparatus An evacuation apparatus comprising (1) a reciprocating vacuum pump, the piston rings and piston shaft sealing material of which are made of a self-lubricating material at least on the surface and in which metallic bellows is or are used to seal between th... | 09/04/1990 |
| 4854825 | Multi-stage vacuum pump A vacuum pump includes two pairs of piston and cylinder assemblies mounted on opposite sides of a crankshaft in a common plane with the gas inlets for the first and second cylinders of a first pair of piston and cylinder assemblies being connected to the ... | 08/08/1989 |
| 4811558 | System and method for providing compressed gas The invention comprises a system and method for providing compressed gas by extracting compressed gas directly from the combustion chamber of an internal combustion engine. The gas may be further compressed using an improved compressor, which in turn may ... | 03/14/1989 |
| 4790726 | Reciprocatory piston and cylinder machine A reciprocatory piston and cylinder machine particularly suitable for use as a vacuum pump includes a cylinder (17), a cylindrical piston (16) relatively slidably reciprocable within the cylinder (17), and means for substantially sealing the annular space... | 12/13/1988 |
| 4695431 | Volumetric pumping apparatus and method for supplying fluids to sheath stream flow cells Apparatus and method are provided for the precisely controlled and coordinated supply of sample and sheath stream fluids to a sheath stream flow cell, and comprise the use of positive displacement differential pumping means which are operable to insure co... | 09/22/1987 |
| 4657488 | Two stage stepped piston air compressor An air compressor with a cylinder (1) has a stepped piston (4) movably disposed therein which performs compression in both stroke directions to provide two-stage compression. Each compression stage is associated with at least one inlet and outlet valve (3... | 04/14/1987 |
| 4643651 | Constant flow rate liquid pumping system The present invention is a liquid pumping system with constant flow rate. The system contains at least one first cylinder means and reciprocating piston means defining a first pumping capacity (V1), at least one second pumping unit including cy... | 02/17/1987 |
| 4627795 | Piston assembly for a compressor or the like A tandem piston arrangement for a compressor, especially for a dry-running compressor for the high pressure compression of gases such as oxygen, has one piston of the common rod form as a guide piston with piston and guide rings in engagement with the res... | 12/09/1986 |
| 4597717 | Two-stage fluid pump Disclosed herein is a two-stage fluid pump comprising a base member defining a sump, a first fluid pumping unit including a pumping piston and supply and discharge passages, a second fluid pumping unit including a pumping piston and supply and discharge p... | 07/01/1986 |
| 4565501 | Two-stage volumetric pump for liquefied petroleum gases in liquid phase A two-stage pump for LPG having two chambers, a valve communicating with the first chamber for the admission of the liquid to be pumped; a second valve communicating with the second chamber for the delivery of the pumped liquid. A transfer duct connects t... | 01/21/1986 |
| 4556367 | Solvent delivery system A solvent delivery system which provides a substantially uniform flow includes two synchronized pistons adapted to serially transport successive solvent compositions from one piston to the other prior to delivery to a chromatography column.... | 12/03/1985 |
| 4538964 | Multistage resonant compressor A multistage resonant reciprocating compressor having opposed cylinders that are driven by a plunger unit. The plunger unit is suspended between a pair of spaced apart flexure springs and is electrically coupled to a linear motor mounted between the sprin... | 09/03/1985 |
| 4492529 | Compressors efficiency improvement The cylinder of a reciprocating compressor is provided with a flanged collar defining an annular recess adjacent the side walls of the cylinder bore disposed for entry of the piston skirt during the downstroke into the recess, compressing gas therein. Com... | 01/08/1985 |
| 4390322 | Lubrication and sealing of a free floating piston of hydraulically driven gas compressor A double acting multistage hydraulically driven gas compressor using a free floating piston including a hydraulic piston and a number of gas compressing pistons, those gas compressing pistons being sealed by high pressure oil supplied from the hydraulic d... | 06/28/1983 |
| 4383804 | Lubrication and sealing of a free floating piston of hydraulically driven gas compressor A double acting multistage hydraulically driven gas compressor using a free floating piston including a hydraulic piston and a number of gas compressing pistons, those gas compressing pistons being sealed by high pressure oil supplied from the hydraulic d... | 05/17/1983 |
| 4368008 | Reciprocating controls of a gas compressor using free floating hydraulically driven piston A double acting hydraulically driven gas compressor using a free floating piston the reciprocating action of which is being controlled by a valve system responsive to pressure peaks, generated in hydraulic system on piston reversal, the pressure level of ... | 01/11/1983 |
| 4165205 | Multi-stage pump A multi-stage pumping assembly comprising a plurality of pumping units arranged end to end in an elongate cylindrical housing. Each pumping unit comprises a solenoid which when energized causes a pumping piston to retract downwardly on its intake stroke, ... | 08/21/1979 |
| 4149831 | Double-acting differential piston supply pump A supply pump comprising a body having an inlet and an outlet both in fluid communication with an interior region of the body which contains two pistons positioned to reciprocate coaxially and which define three variable volume chambers, one between the t... | 04/17/1979 |
| 4111609 | Multistage gas compressor A compact fluid compressor embodying a housing formed of a plurality of stacked sections with relatively large fluid flow passageways cast therein and wherein the overall outline of the compressor's housing is substantially rectangular. This arrangement e... | 09/05/1978 |
| 3998569 | Apparatus for use as a gas compressor or gas blower A gas compressor or blower comprising a cylinder having gas intake and exhaust ports; a piston which is rotatably and reciprocably movable in the cylinder; valve means for admitting gas into and exhausting air from at least one chamber lying to one side o... | 12/21/1976 |
