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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 |
| 7540721 | Automatic inlet check valve release Apparatus and method for releasing a stuck inlet check valve of a paint pump including a solenoid connected to the check valve with a pusher element which momentarily displaces a moveable element such as a ball in the check valve to break any adhesion between the mo... | 06/02/2009 |
| 7216552 | Prognostic and diagnostic system for air brakes Vehicles equipped with air brake systems and onboard vehicle management computers are programmed to develop both a prognosis and diagnosis of problems in the supporting, compressed air supply system from monitoring compressed air supply tank pressure. Variance of me... | 05/15/2007 |
| 7165950 | Two-stage pressure relief valve A two-stage pressure relief valve for use with hydraulic systems is disclosed. The two-stage pressure relief valve has a first stage that relieves increases in hydraulic system pressure over the normal operating pressure and up to a selected threshold pressure level... | 01/23/2007 |
| 7134353 | Method and apparatus for determining system integrity for an oilfield machine In general, in one aspect, the invention relates to a method for determining a system integrity of an oilfield machine operatively coupled to a magnetic drive, wherein the magnetic drive is configured to provide a controlled operational speed, comprising adjusting a... | 11/14/2006 |
| 7131820 | Method for controlling a thick matter pump A method for controlling a thick matter pump comprising two delivery cylinders (10) emerging, via two openings (12), into a material reservoir (14), associated with two delivery pistons (26), symmetrically synchronized relative to said cy... | 11/07/2006 |
| 7086841 | Air compressor with inlet control mechanism and automatic inlet control mechanism An automatic inlet control mechanism and air compressor unit include a valve cavity and valve outlet. The valve cavity includes a valve control chamber and valve inlet chamber. A valve piston assembly is positioned between the valve control chamber and the valve inl... | 08/08/2006 |
| 7028491 | Method and apparatus for reducing inrush current in a multi-stage compressor A compressor assembly having a first compression mechanism operatively coupled to a first motor and a second compression mechanism operatively coupled to a second motor. The first compression mechanism compresses the vapor from a low pressure to an intermediate pres... | 04/18/2006 |
| 6923646 | Process and apparatus for treating an exhaust stream from a dental operatory There is disclosed a process and apparatus for withdrawing an exhaust stream including gas, liquids and solids from the dental operatory connected to the suction side of a vacuum pump wherein solids and liquids are sequentially removed such that compressed gas from ... | 08/02/2005 |
| 6874326 | Air conditioning system with two compressors and method for operating the same Disclosed are an air conditioning system with two compressors and a method for operating the same, so as to variably change a compression capacity of a refrigerant according to the variation of cooling load. Herein, when a full operation order is inputted to the two... | 04/05/2005 |
| 6807818 | Compressor system and vehicle air conditioning system having the same When a compressor apparatus is operated at a maximum displacement for 60 minutes or longer, an ECU controls a pressure control valve to gradually change the refrigerant pressure in a swash plate chamber in a manner that gradually reduces the displacement of the comp... | 10/26/2004 |
| 6764284 | Pump mount using sanitary flange clamp A metering assembly includes a motor removably coupled to a pump using a flange clamp. An annular connection flange is provided at one end of the motor housing; and a cooperating annular connection flange is provided at one end of the pump housing. The connection fl... | 07/20/2004 |
| 6623251 | Spindle apparatus A rod body (30) is formed of magnetostrictive material and includes one end portion (30a) fixed, and a piston (35) is fixed to the other end portion (35b) of the rod body (30). The piston (35) is slidably disposed within a cylinder (36) in which there is ... | 09/23/2003 |
| 6428284 | Rotary vane compressor with economizer port for capacity control The present invention is directed to a method of reducing cooling capacity in a rotary vane compressor in such a way that the power requirement to drive the rotor is reduced to the same extent (or close to) as capacity is reduced. An economizer port opera... | 08/06/2002 |
| 6174137 | Compressor having load control A compressor adapted to be put into a load operating state when there exists the relation PdࣘPSL between the discharge pressure Pd and a set lower limit of pressure PSL and adapted to be put into an unload operating state when ther... | 01/16/2001 |
| 6171072 | Combination aspirator pump and air compressor apparatus for use in medical procedures A combination electric motor driven vacuum pump and air compressor unit, particularly adapted to use in medical procedures, is mounted in an insulated cabinet arranged to provide for drawing cooling air into the cabinet through an inlet duct, cause coolin... | 01/09/2001 |
| 5988989 | Compact hydraulic power unit having a reservoir closed by a manifold having a hydraulic circuit A hydrualic power unit for an auto-hoist lift having a more compact motor and improved noise characteristics. The power unit having a reservoir with a closed end and an open end. A manifold attached to the open end and having an inlet port and an outlet p... | 11/23/1999 |
| 5865568 | Method of and device for suction transporting In a method of and a device for suction transporting a material from an object surface, the suction transporting device has a suction unit and a unit for modulating the suction. A suction is applied to a transporting line by the suction unit so that a mat... | 02/02/1999 |
| 5735461 | High-pressure cleaner with bypass valve for the pump In a high-pressure cleaner of the type comprising a) a high-pressure pump (3), b) a motor driving said pump (3), c) a liquid supply (1,2) connected to the suction side (8) of the pump (3), d) a cleaning gun (4) connected to the delivery side (6) of the pump (3) thr... | 04/07/1998 |
| 5649810 | Apparatus for delivering fluid to a patient A fluid delivery system is disclosed which includes a pump and a fluid delivery set. The fluid delivery set includes a stop cock valve, and the pump includes a valve actuation unit into which the stop cock valve is positioned for operation of the system. ... | 07/22/1997 |
| 5584673 | Device for reducing the pressure of a compressor in the idling and shutdown mode A device for reducing pressure in a compressor when it is in the idling and shut-down mode, in the induction manifold of which there is an induction control valve that controls the passage through the induction manifold, is provided with a bypass line tha... | 12/17/1996 |
| 5577892 | Method of injecting fuel including delayed magnetic spill valve actuation In a method of injection fuel for Diesel engine comprising a high pressure injection pump with a fuel supply line for supplying high pressure fuel to fuel injection nozzles wherein a fuel control line extends between the pump and a low pressure fuel suppl... | 11/26/1996 |
| 5551845 | Medical air vacuum An apparatus is provided for supplying vacuum and compressed air utilities for dental and medical applications. The apparatus comprises a reciprocating piston air compressor for simultaneously producing vacuum pressure at an intake valve thereof and compr... | 09/03/1996 |
| 5443368 | Turbomolecular pump with valves and integrated electronic controls A vacuum system comprises, as an integral assembly, a turbomolecular pump with drive motor, a vent valve, a purge valve, a roughing valve, a heater and an electronic control module. The control module has a programmed processor for controlling the motor a... | 08/22/1995 |
| 5417649 | Fluid transfusing device and method of control therefor A fluid transfusing device and method of control therefor includes a plurality of pump driving portions and a microprocessor. Each pump driving portion is for driving a pump, and the microprocessor controls the pump driving portions. The microprocessor ex... | 05/23/1995 |
| 5352096 | Air compressor for automobiles This invention relates to an air compressor and in particular to one which includes a valve controlling device having a check valve and a cover. The check valve is fixedly mounted on said cover and is connected with a pipe. The check valve including a spr... | 10/04/1994 |
| 5046928 | Long term compressor control apparatus In a compressor control system, a subcontroller is coupled with the master-controller in order to detect, when the bypass valve is being modulated, whether there is a deviation between the minimum inlet valve position assigned to the system and the actual... | 09/10/1991 |
| 4990076 | Pressure control apparatus and method A pressure control apparatus suitable for controlling pressures in autoclaves permits a plurality of autoclaves to be selectably pressurized from a single pressurizing circuit. The apparatus can be externally controlled to more efficiently multiplex autoc... | 02/05/1991 |
| 4863355 | Air compressor having control means to select a continuous or intermittent operation mode An air compressor is controlled such that when the pressure inside a tank for storing compressed air reaches a predetermined lower-limit value, the compressor is brought into a load running state to supply compressed air to the tank, whereas, when the pre... | 09/05/1989 |
| 4832580 | Fluid pressurizing delivery pump system Provided are a pair of pumps, each of which comprises a bellows having an intake inlet and a discharge outlet, a reciprocating drive means for contraction and expansion movements of the bellows, and a couple of electro-magnetic on-off valves disposed resp... | 05/23/1989 |
| 4747755 | Capacity control device for a screw compressor A capacity control device for a screw compressor provided with a capacity control passage and a slide valve adjusting the opening thereof, wherein the slide valve is driven in a closing direction due to a pressure difference between a high pressure and a ... | 05/31/1988 |
| 4589825 | High-pressure cleaning unit with a bypass valve In operating high-pressure cleaning units, the outflow of the water discharged from the associated pump (6,8) may be temporarily interrupted. As the pump normally operates continuously, care must be taken to ensure that the water can then be returned in a... | 05/20/1986 |
| 4545736 | Apparatus for automatically processing slurry A reciprocating ram pump of the well known Willett's type is provided with electrical sensors (S1 and S2) and a solenoid operated valve (56) for controlling reversal of the ram at its delivery and suction stroke limits. The sensor outputs are employed for... | 10/08/1985 |
| 4541274 | Apparatus and method for monitoring and controlling a pump system for a well Pulses produced by a pulse generator coupled to the output shaft of an electric motor that reciprocates a polish rod of a well pumping system are counted by a computer to locate the polish rod at a series of positions during each reciprocation of the poli... | 09/17/1985 |
| 4453893 | Drainage control for compressed air system The invention comprises a valve contained in a drainage line from a compressor tank and a control for operating the valve. The control includes a timer which comprises an air storage tank, an air bleed valve for bleeding the storage tank and structure for... | 06/12/1984 |
| 4439110 | Controlling and regulating device for pumps with constant volume A device for controlling the performance of pumps, having a constant volume such as pneumatic pumps having a constant volume, comprises liquid level detectors, such as magnetic microswitches that cooperate with a magnetized float, and the detectors are ad... | 03/27/1984 |
| 4432698 | Compressor having a starting load reducing apparatus A compressor having a starting load reducing apparatus comprises a main compressor body for compressing gas obtained under suction from an intake chamber through an intake valve within a compression chamber, and ejecting the compressed gas through an outl... | 02/21/1984 |
| 4416592 | Liquid flow control apparatus This liquid flow control apparatus is a delayed closure valve mechanism intended for use in an unloading bypass between the outlet and the inlet of a pump for supplying fuel to an oil burner. The valve mechanism includes a conduit having a large diameter ... | 11/22/1983 |
| 4412788 | Control system for screw compressor An electronic control system for sequential actuation of a four-way solenoid valve is used to selectively load and unload a slide valve control for a screw compressor. The electronic control system can be responsive to output or refrigerant pressure or ev... | 11/01/1983 |
| 4388046 | Rotary compressors A rotary oil sealed compressor including an unloader valve to restrict or close the compressor intake when the compressor pressure rises above the normal working pressure (i.e. when the demand for compressed air drops or ceases) and a minimum pressure val... | 06/14/1983 |
| 4267704 | Timing circuit for air conditioner chiller A timing circuit is coupled to control operation of a chiller system in an air conditioner. The timing circuit includes an initial timer to limit to a minimum the amount of coolant initially admitted to an air conditioner compressor upon startup. This dra... | 05/19/1981 |
