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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7275916 | Integrated engine/compressor control for gas transmission compressors A method and system for controlling an engine that drives a reciprocating compressor, such as the large compressors used for natural gas transmission. A controller receives data from the compressor representing operation conditions, such as load step, suction pressu... | 10/02/2007 |
| 7003838 | Hydraulic pig advance system comprising a control volume chamber containing hydraulic fluid and a force transmitting member This invention relates to a hydraulic pig advance system comprising a control volume chamber containing hydraulic fluid and a force transmitting member. The system further comprises two directional control valves which can be selectively repositioned to cause hydrau... | 02/28/2006 |
| 6767190 | Methods of operating an electrostatically actuated pump Methods and apparatus for electrostatically pumping fluids without passing the fluids through the electric field of the pump are contemplated. Electrostatic forces are preferably used to move the diaphragms in one direction, while elastic and/or other restorative fo... | 07/27/2004 |
| 6729856 | Electrostatically actuated pump with elastic restoring forces An apparatus for electrostatically pumping fluids without passing the fluids through the electric field of the pump is contemplated. Electrostatic forces are preferably used to move the diaphragms in one direction, while elastic and/or other restorative forces are u... | 05/04/2004 |
| 5997259 | Electronic engine - air compressor system An electronically controlled diesel engine for a vehicle which may act as an air compressor in addition to acting as a power source for the vehicle. When acting in the air compressor function, one end cylinder is converted to the function to provide compr... | 12/07/1999 |
| 5131819 | Apparatus for and method of managing liquid under pressure An apparatus for managing liquid under pressure having a first volume containing a liquid at a first pressure and a second volume containing liquid at a second, lower, pressure and energy storage means to receive and store energy derived from said first v... | 07/21/1992 |
| 5050380 | Means for receiving and subsequently emptying hydraulic fluid from a hydraulic system A means for receiving and subsequently emptying hydraulic fluid from a hydraulic system is described. It comprises a working cylinder (1) and a supply conduit (8) disposed between a pump and the working cylinder for supplying hydraulic fluid at high press... | 09/24/1991 |
| 4836198 | Portable ventilating device A portable ventilating device for ventilating patients in the field. A reciprocating piston divides a cylinder into a pressure chamber and a spring chamber in which a compression spring acts against the piston. Gas pressure applied to the pressure chamber... | 06/06/1989 |
| 4743171 | Marine installation including fuel/oil mixing device An apparatus comprising a housing, a wall dividing the housing into high and low pressure chambers having a pressure differential therebetween, the wall including a surface partially defining the high pressure chamber, and a passage communicating with the... | 05/10/1988 |
| 4741673 | Apparatus for and a method of transferring liquid An apparatus for transferring liquid between regions of a first and a second pressure comprising: a vessel, a dividing member in the vessel, the vessel and the dividing member being relatively movable to divide the vessel into separate variable volume cha... | 05/03/1988 |
| 4611982 | Injection-molding system for the processing of casting resin A casting system for the processing of casting resin. From evacuatable storage containers casting resin components are fed to pump cylinders. The movement of the pump cylinders is synchronized through a mechanical connection. The drive of the pistons in t... | 09/16/1986 |
| 4609073 | Progressive distributor for lubricants A progressive distributor 1 for lubricants is provided, where the lubricant is fed in under pressure via a joint channel 20 and then discharged in several discharge channels and ports 25 to 28. At least two successively disposed piston elements 4, 5 are e... | 09/02/1986 |
| 4601642 | Hydraulic pressure intensifier A hydraulic pressure intensifier is used to raise the pressure in an accumulator above a given input pressure. An oscillating piston provides a boost pressure while a pilot valve and a dump valve and restrictors allow the oscillating piston to move.... | 07/22/1986 |
| 4555221 | Fluid pumping device for use with a fluid pump A fluid pumping arrangement including a fluid pump including a suction port, and a fluid pumping device comprising a pump housing defining a recess, and a moveable wall which is located in the recess and which cooperates with the recess to define a variab... | 11/26/1985 |
| 4547134 | Dosing device The invention relates to a device for dosing or for pumping in a controlled manner a liquid or slurry, a device having a piston freely reciprocating in a cylinder; members connected to the cylinder on the opposite sides of the path of the piston movement ... | 10/15/1985 |
| 4541450 | Liquid proportioning system There is provided a proportioning system for mixture of the fluid to a liquid-carrying main line in a substantially constant, presettable proportion to the flow rate of the liquid in the main line. The system comprises pump means for drawing a quantity of... | 09/17/1985 |
| 4494913 | Positive displacement injector A positive displacement injector for automatic centralized lubrication systems is constructed to include a two-piece disk-seal valve assembly that acts as a check valve and also provides seals at oppositely facing surfaces. The assembly consists of a stif... | 01/22/1985 |
| 4377374 | Spring actuated piston pump A spring actuated piston pump for use in lubricating the bearings of a turbo-charger rotor, both on starting and stopping an associated internal combustion engine. The pump has a piston-and cylinder combination the piston of which is spring-urged towards ... | 03/22/1983 |
| 4369633 | Multiple stage compressor with flash gas injection assembly A multiple stage compression system, as used in refrigeration apparatus, includes an injection assembly for flash gas resulting from expansion of high-pressure liquid refrigerant. The vapor fraction of the expanded mixture of vapor and liquid is injected ... | 01/25/1983 |
| 4369623 | Positive displacement engine with separate combustion chamber An engine with positive displacement piston chambers, an external combustion chamber from which combustion gases pass through suitable valving to piston chambers, an air compressor, a heat exchanger where exhaust gases from the piston chambers preheat com... | 01/25/1983 |
| 4360323 | Proportioning pumping system for dialysis machines A compact and highly reliable proportioning pumping system for supplying a precise and controllable mixture of concentrate and water in a kidney dialysis machine comprises a central body and a pair of oppositely mounted pivotable linkages coupled to the b... | 11/23/1982 |
| 4304529 | Apparatus and method for delivering and metering fluids A metering system for delivering and metering two combinable and cooperatable liquids, in predetermined ratios in order to enable ultimate combining of such liquids or the fluids. The apparatus comprises a first discrete valve mechanism which is capable o... | 12/08/1981 |
| 4184808 | Fluid driven pump A pump has three gears disposed in three cavities of a housing, with the first and second gears being connected and the second and third gears being connected. A pressurized fluid source is connected to the housing for rotating the gears, whereupon fluid ... | 01/22/1980 |
| 4060347 | Liquid fuel pumping apparatus A fuel injection pumping apparatus includes a first valve means for supplying fuel under pressure to one end of a piston the displacement of which effects fuel flow to the engine at a substantially unrestricted rate, and a second valve means which when op... | 11/29/1977 |
| 4037995 | Liquid propellant gun (damper) A liquid propellant gun utilizes a differential piston having a plurality of bores through its head, which head divides the liquid propellant pumping chamber from the combustion chamber, and propellant supply means providing liquid propellant under pressu... | 07/26/1977 |
| 4030860 | Variable proportional metering apparatus A fluid metering apparatus having paired cylinders, pistons and piston rods. The piston rods are connected to a lever or walking beam which, when pivoted at its center equidistant between the rod connections provides controlled equal travel distance and r... | 06/21/1977 |
| 4023463 | Liquid propellant gun (check valve and damper) A liquid propellant gun utilizes a differential piston having a plurality of bores through its head, which head divides the liquid propellant pumping chamber from the combustion chamber, and propellant supply means providing liquid propellant under pressu... | 05/17/1977 |
