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| Number | Title | Issue Date |
| 8083493 | Transport device for sterile media For water-jet surgery pump devices are known by means of which a sterile fluid is transported through a reservoir to the surgical instrument by means of piston pumps or similar volumetrically transporting pumps. In accordance with the present invention it is propose... | 12/27/2011 |
| 7342756 | Fault recognition in systems with multiple circuits A method for detecting compressor or system degradation or malfunction in a multiple circuit compressor system includes the steps of providing a multiple circuit compressor system including at least a first circuit and a second circuit; and comparing a first value c... | 03/11/2008 |
| 7316672 | Portable wound treatment apparatus A portable wound treatment apparatus, for stimulating the healing of superficial wounds, comprises a housing containing a suction pump and a canister for containing fluids drawn from the wound. The housing is supported on a harness or belt worn by the patient. The c... | 01/08/2008 |
| 7195462 | Method for controlling several pumps The invention relates to a method for controlling several pumps in a pump sump, with which each pump comprises a switch which switches on the pump and each pump after its running is first blocked and depending on the running of the further pumps in the pump sump is ... | 03/27/2007 |
| 7186244 | Portable wound treatment apparatus A portable wound treatment apparatus, for stimulating the healing of superficial wounds, comprises a housing containing a suction pump and a canister for containing fluids drawn from the wound. The housing is supported on a harness or belt worn by the patient. The c... | 03/06/2007 |
| 7153418 | Artificial pond An artificial pond having a motor pump unit with a brushless permanent magnet synchronous alternating current motor that is wound for operation on an alternating current voltage not greater than fifteen volts, and a step down transformer that converts 120 volts AC t... | 12/26/2006 |
| 7127850 | Internal building pressure apparatus and method An internal building pressure apparatus includes, in a building with walls and more than floor, at least one pressure sensor on at least more than one floor. A connection is provided for connecting pressure sensors and an analysis device is connected to the pressure... | 10/31/2006 |
| 7055546 | Fluid intake pressure regulating system A fluid intake pressure regulating system of this invention maintains the pressure of fluid entering a pump below a preselected level for avoiding undesirably high fluid discharge pressure exiting the pump. ... | 06/06/2006 |
| 7015819 | Event notification system and wet well monitor An alarm detection device for monitoring high level signal in a wet well. The alarm detection device includes a fail safe circuit and an emulation circuit. The incoming high level signal is fed into the fail safe circuit and the emulation circuit. The emulated signa... | 03/21/2006 |
| 6996944 | Fire barriers for multi-dimensional architectural expansion joints Multi-dimensional, multi-layered, fire barriers for use in multi-dimensional architectural expansion joints may comprise a plurality of fire resistant material layers and the method for making such barriers is taught. The layers comprising the fire barriers may be c... | 02/14/2006 |
| 6419454 | Air compressor control sequencer A controller for managing a plurality of compressors in an efficient manner such that the system uses less energy, has lower maintenance cost and experiences less wear. For a system with multiple compressors the controller has the minimum number of compre... | 07/16/2002 |
| 6186743 | Multiple pump sequencing controller A sequential controller is provided for sequencing multiple electric loads such electric pumps. That is, for each cycle the next load is designated as the lead load in a round-robin fashion. The controller uses cost effective electro-mechanical relay logi... | 02/13/2001 |
| 6142740 | Compression system having means for sequencing operation of compressors A compression system includes a sequencing switch movable between a first switch position and a second switch position for alternating a first compressor and a second compressor between a lead mode and a lag mode so that one of the compressors is always i... | 11/07/2000 |
| 5811669 | Cycling compressor performance metering A computational sequence that allows a stand-alone instrument or a central data processing unit to calculate flow of compressed ideal gases based on measurements of pressure and time only, in systems where compressors start and stop at regular intervals a... | 09/22/1998 |
| 5449274 | Sump system having timed switching of plural pumps An electronic pump selector system uses a programmable processor to select one of a plurality of pumps to be energized in response to an appropriate feedback signal from the selected pump. A current limited feedback circuit is incorporated which provides ... | 09/12/1995 |
| 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 |
| 5343384 | Method and apparatus for controlling a system of compressors to achieve load sharing Load sharing is achieved in a multiple compressor system by a program in a computer which sends signals to, and receives data from, a microcontroller located at each compressor. One compressor, designated as the lead compressor, furnishes its operating pa... | 08/30/1994 |
| 5309727 | Reactive control for discrete chiller units System and process are disclosed for reacting to conditions that may arise in a plurality of discrete chiller units all individually controlled by dedicated control units. The system and process react to temperature conditions of the coolant when it enter... | 05/10/1994 |
| 5231846 | Method of compressor staging for multi-compressor multi-circuited refrigeration systems A method of staging and modulating compressors in a multi-circuited refrigeration system including a plurality of condensing heat exchange circuits where each condensing heat exchange circuit includes a plurality of compressors. The method comprises the s... | 08/03/1993 |
| 5211031 | Scroll type compressor and refrigeration cycle using the same A scroll type compressor having a pair of scroll type compression units which are encased in the same casing so as to make a common use of a lubricating oil reservoir provided in the casing, wherein the compression units have compression elements, drive s... | 05/18/1993 |
| 5123256 | Method of compressor staging for a multi-compressor refrigeration system A method of staging a plurality of compressors in a refrigeration system. The method comprises the steps of: accumulating a first operative condition for each compressor; accumulating a second operative condition for each compressor; initiating operation ... | 06/23/1992 |
| 4941596 | Mixing system for use with concentrated liquids Mixing concentrates requires the precise dispensing of predetermined amounts of concentrate into predetermined amounts of liquid and such mixes can be obtained by the use of a system having two positive displacement pumps, one for pumping larger volumes w... | 07/17/1990 |
| 4580947 | Method of controlling operation of a plurality of compressors Disclosed is a method of controlling the operation of a plurality of compressors each having at least one capacity controller capable of changing the discharge rate of the compressor in a stepped manner in such a manner as to provide a total discharge rat... | 04/08/1986 |
| 4551068 | Duplex pump controller A 100% solid state, liquid level control circuit which utilizes printed board construction with integrated circuits to control duplex pumps. Mercury switches provide information to the solid state, non-inductive input interface circuitry which relays this... | 11/05/1985 |
| 4537047 | Truck transport refrigeration unit A transport refrigeration unit of the type which has a single or common refrigerant circuit, and a truck engine driven compressor 22 and a mutually, exclusively operable standby compressor 34 is provided with an arrangement of suction line fitting 46 with... | 08/27/1985 |
| 4502842 | Multiple compressor controller and method The multiple compressor controller and method accomplishes the control of a plurality of variable sized compressors in a multiple compressor distribution system to maintain system pressure at a desired level while maximizing compressor operating efficienc... | 03/05/1985 |
| 4444545 | Pump control system This is a digital solid state control system for pumping liquid to regulate the condition of the liquid in a container, such as the liquid level. One pump is turned on when the liquid rises to one level, and another pump is turned on when the liquid rises... | 04/24/1984 |
| 4437811 | Submersible pump with alternate pump operation control means A submersible pump adapted to pump out the liquid in a reservoir has a built-in control unit for alternate pump operation. The control unit includes step memory means which provides a signal to permit the starting of pump operation every other time a high... | 03/20/1984 |
| 4341504 | Pump control system A bubbler tube is used to sense the liquid level in a wet well. Controls provide a constant flow of air, approximately 11/2 to 1 cubic foot per hour, through the bubbler tube which extends to about 6 inches above the top of the pump suction pipe. The pres... | 07/27/1982 |
| 4341983 | Automatic sequence control system An automatic system for controlling a plurality of motors includes motor starting circuitry and motor stopping circuitry that serves to sequentially start and stop the motors in the same cyclic order. The starting circuitry has a sensing component for sen... | 07/27/1982 |
| 4297081 | Liquid level control system A pump control system using a purge bubbler, a flat plate manometer having level sensing contacts therein, and control relays and alarms. The flat plate manometer includes a rectangular mercury column having calibration scales and a number of stainless st... | 10/27/1981 |
| 4179242 | Method and apparatus for liquid supply A method and an apparatus for liquid supply use a pressure tank and a plurality of pumps. When the pressure or liquid quantity in the pressure tank has decreased below a predetermined level, a preceding or regular pump starts. When the demand is too large... | 12/18/1979 |
