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An aircraft having vertical takeoff and landing capability provided with at least first and second laterally extending paddle wheels rotatable on a central axis perpendicular to the longitudinal axis of the aircraft fuselage and between its nose and tail.
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| Number | Title | Issue Date |
| 7442292 | Liquid visual display A display provides an indication of the remaining useful life of a filter element by providing a visible level of fluid in the display corresponding to the remaining useful life. The fluid level is adjusted by a valve responsive to a pressure differential across the... | 10/28/2008 |
| 7387080 | Pneumatic actuator movement indicator Disclosed is a pneumatic actuator movement indicator comprising a housing adapted to be connected in series between a pneumatic actuator and a source of pressurized fluid for the actuator, and an indicator located in, and having an equilibrium position in, the housi... | 06/17/2008 |
| 7360433 | Filter change indicator A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned e... | 04/22/2008 |
| 7303613 | Filter sensor and indicator for vacuum cleaners A pressure actuated electrical switch and indicator to indicate to a user that a filter vacuum cleaner requires cleaning or replacing. In a first embodiment, the pressure actuated electrical switch measures the pressure present between the filter media and the flow ... | 12/04/2007 |
| 7285147 | Air supply systems and pressure adjustment devices for use therewith An air supply system for a clean room with a critical machine. An intake duct connects the exterior of the clean room to a make-up air unit, and is configured to transport external air into the make-up air unit. A first air duct connects the make-up air unit to an a... | 10/23/2007 |
| 7244294 | Air filter monitoring system A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or... | 07/17/2007 |
| 7156239 | Filter unit for freezable liquids, particularly for a metering unit of an exhaust gas treatment device A filter unit for liquids undergoing freezing for a metering unit of an exhaust gas treatment unit has a housing having an outer member and a lid member. At least one filter insert is arranged in the housing. An elastically deformable casing part is provided that su... | 01/02/2007 |
| 7137303 | Filter change indicator A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned e... | 11/21/2006 |
| 7124627 | Air filter restriction sensor assembly An air filter restriction sensor assembly for use on an engine, such as a small gas engine provides a simple on/off system with remote indicating to notify the operator of the air restriction. More specifically, the air restriction in the air intake line of the engi... | 10/24/2006 |
| 7008465 | Cleanable high efficiency filter media structure and applications for use An improved cartridge, typically in cylindrical or panel form that can be used in a dry or wet/dry vacuum cleaner. The cartridge is cleanable using a stream of service water, or by rapping on a solid object, or by using a compressed gas stream, but can provide excep... | 03/07/2006 |
| 6976448 | Restriction indicator The present disclosure relates to a restriction indicator for an air cleaner system of an internal combustion engine. The restriction indicator includes a housing divided into first and second chambers by a diaphragm. A signal member is connected to the diaphragm. T... | 12/20/2005 |
| 6955169 | Inhaler device A device used with fluid canisters comprising a transparent body allowing the viewing of movement within the body having a minor and major cavity with a float indicator and float seat within the minor cavity. An inhaler top and bottom fits each end of the body formi... | 10/18/2005 |
| 6949934 | Fault-annuciating system for a transformer A preferred embodiment of a transformer includes a core, and a primary and a secondary winding positioned on the core so that the primary and secondary windings are inductively coupled when the primary winding is energized. The transformer also includes a sensor for... | 09/27/2005 |
| 6817311 | Pressure indicator A pressure indicator and a corresponding method are disclosed, the pressure indicator comprising a display diaphragm, optionally transparent, and an indicator diaphragm coupled to and in fluid communication with the display diaphragm. In use, pressure is applied to ... | 11/16/2004 |
| 6758980 | Liquid filter with separate and calibrated vapor release A liquid filter (10) housing an annular filter element (16) has an annular space or inlet chamber (24) between the filter element and the housing and viewable through the housing such that an operator can see the level of liquid in the inlet cha... | 07/06/2004 |
| 6641742 | Liquid filter with separate and calibrated vapor release An annular space or inlet chamber 24 between the filter element 16 and housing of a liquid filter is viewable such that an operator can see the level of liquid in the inlet chamber as an indication of when to replace the filter element: the higher the liq... | 11/04/2003 |
| 6604486 | Restriction indicator The present disclosure relates to a restriction indicator for an air cleaner system of an internal combustion engine. The restriction indicator includes a housing divided into first and second chambers by a diaphragm. A signal member is connected to the d... | 08/12/2003 |
| 6383243 | Quick connect fluid coupling for an air cleaner The invention provides an apparatus and method to monitor air filter restriction within an air cleaner system of a motor vehicle. The invention uses a quick connect couplig to allow fluid communication between a restriction gauge and the air cleaner housi... | 05/07/2002 |
| 6375833 | Filter assembly with UV treatment, filter bypass, and clogging indicator A filter assembly for filtering pond or aquarium water includes a container (1,2) with an inlet chamber (15) having an upstream region (36) and a downstream outlet (13) leading to an outlet chamber (22). A filter (16) is positioned in the inlet chamber (1... | 04/23/2002 |
| 6327902 | Air filter restriction indicator gauge A low cost air filter restriction indicator gauge for use in conjunction with an internal combustion engine can be achieved by both simplifying individual part configuration and reducing overall part count. More specifically, a simplified design can be ac... | 12/11/2001 |
| 6307466 | Two stage gauge with electrical signal output A two stage air filter restriction indicating device communicates with the supply of air passing from an air filter to the air intake of an engine. The amount of vacuum required by the engine to supply air is directly indicative of the amount of blockage ... | 10/23/2001 |
| 6268791 | Switch gauge An air filter restriction indicating device communicating with the supply of air passing from an air filter to the air intake of an internal combustion engine. The indicating device senses a decrease in the supply of air drawn through the air filter by th... | 07/31/2001 |
| 6190442 | Air filter gauge An air filter cleanness gauge is provided. The gauge in a preferred embodiment includes a transparent cover. The housing has a first opening for fluid communication with the atmosphere and a second opening having fluid communication with a fluid source ex... | 02/20/2001 |
| 6161417 | Restriction indicator for air cleaners A restriction indicator for an air cleaner of an internal combustion engine. A bellows-type diaphragm is biased toward a retracted position by a first end of a compression spring. A calibration wheel threadingly engaging the housing supports a second end ... | 12/19/2000 |
| 6142094 | Depth sensitive mechanical acoustic signal generating device A simple, mechanical device is provided which produces an acoustic signal a specified depth. The device consists of a shear plug in an exterior wall of the device housing which prevents the movement of a spring biased piston. The plug is subjected to inc... | 11/07/2000 |
| 6096224 | Filter alert A filter alert has a pressure differential switch that is responsive to positive and/or negative pressure through a pressure tube. The pressure tube is in fluid communication intermediate a positive-pressure or high-pressure side of an intended filter and... | 08/01/2000 |
| 6026539 | Upright vacuum cleaner with full bag and clogged filter indicators thereon A vacuum cleaner comprises a housing having a floor-engaging nozzle fluidly interconnected with a filter bag in a closed filter bag chamber in the housing through a suction passageway, an exhaust vent in the filter bag chamber to exhaust filtered air exit... | 02/22/2000 |
| 5942193 | Daily air removal test for sterilizers A device for evaluating air removal is subjected to a sterilization process whose effectiveness is dependent on a sufficiently high vacuum being achieved. A closure or lid (20, 70) seals an opening into an interior chamber (12) of a container (10). The cl... | 08/24/1999 |
| 5879544 | Differential pressure indicator A differential pressure indicator has a piston across which inlet and outlet pressures are applied with a spring preventing movement of the piston until a predetermined differential pressure is exceeded. At this point, a port is opened to allow the inlet ... | 03/09/1999 |
| 5845597 | Separation medium efficiency indicator An efficiency indicator for a separation system, such as a water filter, wherein a first volume of fluid is exposed, under a first pressure, to a separation medium and a second volume of fluid is recovered therefrom, under a second, lesser pressure. The i... | 12/08/1998 |
| 5774056 | Gauge for monitoring air filters An indicating device includes a housing that is separated into two sub-chambers by a flexible diaphragm. A indicating member is carried by the diaphragm so that the diaphragm and the indicating member move, within the housing, responsively to changes in t... | 06/30/1998 |
| 5739755 | Sensor for monitoring the cooling liquid of heat exchanger circuits A sensor for monitoring a cooling liquid circulating in a circuit of a heat exchanger of an automobile, for example, includes a support for mounting the sensor on a pipe of the circuit so that the liquid is in contact with at least a part of the sensor, a... | 04/14/1998 |
| 5702592 | Filter monitoring device which monitors differential pressure and temperature A filter monitoring device for use in monitoring the purity of a fluid through a filter includes a pressure differential sensing device in communication with the filter. The filter monitoring device defines an inlet port which is in communication with the... | 12/30/1997 |
| 5638059 | Audible altimeter for parachutists The invention relates to an audible altimeter for use by parachutists. The altimeter comprises a sensor means 6 for sensing ambient air pressure, an electronic processor 5, a sounder device 4 and control buttons 2,3. The electronic processor 5 is programm... | 06/10/1997 |
| 5623891 | Internal fault indicator for a transformer The internal fault indicator includes an open ended housing mounted in an opening in the wall of a transformer casing. An indicator lens is attached over a first open end of the housing and a diaphragm is attached over a second open end of the housing wit... | 04/29/1997 |
| 5616157 | Visible restricted filter indicator A filter indicator system for indicating when air flow through a filter is restricted includes an indicator mounted in a filter assembly downstream of the filter. The indicator includes a housing having a central space, a side wall, an end wall, an end in... | 04/01/1997 |
| 5595138 | Apparatus for detecting operational anomalies in pressurized fluid circuits The present invention relates to an apparatus for detecting operational anomalies in a pressurized fluid circuit having a main pump, a fluid filter and a booster pump connected in series. The apparatus has an indicating detector to provide an indication o... | 01/21/1997 |
| 5437241 | Differential pressure indicator A differential pressure indicator includes a housing having first and second pressure ports for fluid and a bore communicating with the pressure ports. A piston is movable in the bore between an actuated and an unactuated position in response to a pressur... | 08/01/1995 |
| 5195376 | Fluid pressure differential monitor A device for continuously monitoring the difference in pressure of fluid in two closed spaces and separated by a dividing wall comprises an open-ended tubular housing which is secured to a rigid tube passing through and rotatably mounted in a horizontal p... | 03/23/1993 |
| 5057821 | Filter sentry apparatus An apparatus including a housing secured to a filter web, wherein the housing includes a reciprocating rod directed orthogonally through the housing relative to the filter web, whereupon plugging of the filter web permits the rod to be directed through th... | 10/15/1991 |
