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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 |
| 7617725 | Electric generator protection system A protection system for an electric generator includes a fluid sensor to measure a fluid level in a fuel tank, an indicator lamp to display the fluid level, a timer to measure a time interval beginning in response to a low fuel signal from the fluid sensor and a low... | 11/17/2009 |
| 7340953 | Liquid measuring vessel The present invention relates to a liquid measuring vessel having a removable volume indicating clip. ... | 03/11/2008 |
| 7334536 | Pop-up sewer backup indicator An improved sewer backup indicator. The sewer backup indicator is installed into a sewer cleanout cap housing which comprises a pop-up device that detects and holds the detection of a back up in the sewer system, which is due to number of reasons. This invention hel... | 02/26/2008 |
| 7284422 | Fluid level measurement device A device measures the high and low fluid levels of a fluid body. A housing has a shaft with a buoyant weight, the shaft protruding through a cap on the housing's top and capable of sliding through the cap. A first ring encompasses the shaft and is initially position... | 10/23/2007 |
| 7231821 | Vertical liquid level measuring device A system for actuating an indicator in response to a depth change in a liquid that is confined to a container comprises a housing, a float constrained to vertical movement in response to changes in liquid depth in the container, a drive rod arranged to rotate in res... | 06/19/2007 |
| 7216670 | Drain apparatus with liquid trap and liquid level indicator A buoyant liquid level indicator device is positioned within liquid drain apparatus having a trough accommodating liquid to form a liquid seal to prevent passage of gas through the liquid drain apparatus. The indicator device will float and be exposed to an outside ... | 05/15/2007 |
| 7188521 | Horizontal liquid level measuring system A liquid level measuring system includes a housing mounted to a container and a flexible coupling connected between the housing and a tubular frame suspended in a container holding a liquid. The flexible coupling maintains the tubular frame in a vertical orientation... | 03/13/2007 |
| 7174784 | Apparatus for measuring a fluid level and methods An apparatus for measuring a fluid level includes a housing with a level indicator adapted to display a measured fluid level. A float is associated with the level indicator and an elongated flexible member is provided with a first end and a second end, wherein the f... | 02/13/2007 |
| 7082827 | Leak detector An example of an apparatus for detecting the lowering of a top surface of a liquid includes a housing that has a housing hole, and an insertion member attached to the housing. A dowel is inserted into the housing hole, and a float is attached to the dowel. A detecto... | 08/01/2006 |
| 7004011 | Leak detector A device for detecting leaks in containers that are open to the effects of rain and/or evaporation comprising an outer cylinder or container partially submerged in a container or vessel to be measured, such as, a swimming pool, three adjustable legs attached to the ... | 02/28/2006 |
| 6955083 | Vertical liquid level measuring device A system for actuating an indicator in response to a depth change in a liquid that is confined to a container comprises a housing, a float constrained to vertical movement in response to changes in liquid depth in the container, an actuator connected to the housing ... | 10/18/2005 |
| 6913438 | Pump lubrication system including an external reservoir A circulating lubrication system for a centrifugal pump, or other rotating equipment utilizing an oil sump, is disclosed. The lubrication system includes an external reservoir located distant from the main lubrication chamber, so that lubricating fluid from the main... | 07/05/2005 |
| 6786091 | Gutter overflow detection device and system An overflow detection device is capable of determining whether liquid outside of the device has reached a predetermined level associated with an overflow condition. A container has a closed end and a capped end opposite the closed end. The container has an enclosing... | 09/07/2004 |
| 6763780 | Fill level indicator for agricultural material bin A fill level indicator assembly for an agricultural material bin such as a seed dispensing hopper. The assembly includes an elongate sighting member which provides a water impermeable cover over an indicator opening in the bin cover and has a transparent portion pro... | 07/20/2004 |
| 6647764 | Quartz crystal microbalance with feedback loop for automatic gain control An analytical apparatus, such as a quartz crystal microbalance, comprising a piezoelectric sensor and an oscillator circuit, coupled to the sensor, to oscillate at a frequency substantially determined by a resonant frequency of the sensor, and to provide ... | 11/18/2003 |
| 6530274 | Apparatus for liquid level measurement in a container A liquid level measuring device for measuring the level of liquid in a storage or dispensing tank has an elongated tubular hollow body that carries a threaded coupler adapted for engaging a threaded nipple on top of the tank. A buoyant float is attached t... | 03/11/2003 |
| 6289728 | Apparatus and method for determining the amount of liquid contained in a storage tank An apparatus and method for determining the amount of liquid contained in a railroad tank car, or any other liquid storage tank having an interior region defining a predetermined relationship between liquid level and volumetric content. A tube having a cl... | 09/18/2001 |
| 6223596 | Portable clamp-on liquid level indicator gauge Apparatus and method are provided for indicating the amount of liquid contained in a railroad tank car, or any other liquid storage tank having an interior surface defining a liquid level reference point. A readily portable liquid level indicator gauge is... | 05/01/2001 |
| 5975131 | Tank valve and opening sensor A device for providing remote indication of the opening of a weighted pallet type tank vent in which a permanent magnet is attached to the end of the pallet guide shaft distal to the pallet. A magnetic induction sensor is secured to the outside of the sha... | 11/02/1999 |
| 5862775 | Sewer backup indicator The present invention is a sewer back-up indicator that is positioned within the hole in the cover of the manhole. The indicator includes a bushing and a rod having a valve at one end and an inflatable balloon at the other. The valve is adapted to receive... | 01/26/1999 |
| 5588779 | Sight, vent, and drain assembly for an underground tank An improved method and apparatus for use with an underground tank of fire suppression fluid in which the fluid level within the tank can be visually determined quickly during pumping operations. Also, the fluid in the underground tank is protected from fr... | 12/31/1996 |
| 5551290 | Leak detector A device for detecting leaks in containers that are open to the effects of rain and/or evaporation comprising an outer cylinder or container suspended in a container or vessel to be measured, such as, a swimming pool, an inner tube, an outer floating tube... | 09/03/1996 |
| 5279252 | Fuel tank level indicator A fuel tank level indicator for indicating at a surface when a fuel tank is filled with fuel, such indicator installed on a fuel inlet pipe and having a loop pipe in line with the inlet pipe with a riser pipe at the top of the loop and a float member disp... | 01/18/1994 |
| 5269184 | Device for measuring and controlling ground water levels and method of manufacturing such device A device for measuring and/or controlling ground water levels and a method of manufacturing such device. An embodiment of the device comprises a first tubular member having a top and bottom end and a plurality of perforations for allowing liquid, such as ... | 12/14/1993 |
| 5020367 | Tank-level gauge The tank-level gauge comprises an outer tube sealed at its lower end and adapted for attachment to the top wall of a tank. The gauge also comprises two telescoping rods axially movable within the outer tube. A float encircles the outer tube. Magnets respe... | 06/04/1991 |
| 4887465 | Transducers for hostile environments A screened inductance level transducer has a drive winding for setting up a drive field, and a sense winding in which voltage is induced in the presence of the drive field. A conductive screen, which may be of stainless steel, is mounted on a float for mo... | 12/19/1989 |
| 4821022 | Float assembly checking system An apparatus for checking the workability of a float assembly used to determine the level of liquid in a vessel is disclosed and comprises: a float extension associated with the float of the float assembly and movable when the float assembly is in working... | 04/11/1989 |
| 4806902 | Fluid level monitor and filler assembly A monitor and filler assembly providing an easily observable reading as to the fluid level in a reservoir such as an automatic transmission or crankcase of an automobile. The filler may be integrally formed with the monitor to allow for easy replenishing ... | 02/21/1989 |
| 4736077 | Low oil cut off switch A low oil cut off switch is provided and consists of a dual magnetic switch within a housing that is adjustably and slideably mounted to transparent tube of a rising stem fuel indicating gauge of a fuel storage tank. The dual magnetic switch which when at... | 04/05/1988 |
| 4653423 | Automatic dishwasher condition indicator An indicator placed within a dishwasher showing whether or not the dishwasher has performed its dishwashing cycle employing a two-piece hollowed elongated casing apertured at one end for receiving dishwashing fluid when placed in a vertical position in th... | 03/31/1987 |
| 4526033 | Fill gauge for safety and waste disposal drums A fill gauge is provided which may be used in connection with a storage container to inform an operator of the relative status of a filling operation. A multiplicity of indicia are progressively displayed to provide an initial warning when the filling ope... | 07/02/1985 |
| 4513185 | Float operated electrical switch assembly A float operated electrical switch assembly including a body, a float coupled to the body for pivotal movement relative thereto about a first axis, a permanent magnet carried by the float and having its dipole axis parallel to the first axis, and a reed s... | 04/23/1985 |
| 4400881 | Apparatus for locating the level of liquid in a vessel An apparatus is provided for locating the level of liquids for particular use in volumetric dosage techniques. A probe is mounted upon a vertical column which slides axially in a slide fixed in the housing of the apparatus. Adjacent to the slide is a thre... | 08/30/1983 |
| 4220048 | Cooler and level indicator for beer kegs A cooler and level indicator for beer kegs comprising an insulated container for holding iced water in contact with a keg of beer, an insulated cover for sealing the container and an externally readable level gauge for indicating the iced water level, sai... | 09/02/1980 |
| 4219269 | Developing drum for photographic material A film-developing tank has a vessel having an opening and being adapted to receive a film to be developed and a developing medium for the film, and a cover axially closing the opening of the vessel. The cover has an axially outer funnel-shaped portion for... | 08/26/1980 |
| 4184011 | Battery refill indicator A battery refill indicator including a cap having a screw type base and an enlarged cover including a central opening and a float-type liquid level indicator supported by said cap and including a stem extending outwardly through said central opening in sa... | 01/15/1980 |
| 4182157 | Soil percolation testing apparatus Percolation testing apparatus comprising an elongated guide rod having one end to be driven into the bottom of a test hole for simple and sole support of the rod along which a gauge rod is slidable by means of guide brackets on the latter and a scale stri... | 01/08/1980 |
| 4171593 | Pot including water level indicator Pots for growing plants including water-level indicators therefor, wherein the pot includes an outer pot and an inner pot supported therein having a lower portion of reduced diameter through which water is conducted upwardly by surface tension activity, a... | 10/23/1979 |
| 4170136 | Level indicator for frozen confection dispenser A tank level indicator having a mounting sleeve and a floating indicator rod slidably mounted in the sleeve. The sleeve has an inner wall from which projects inwardly a series of circumferentially spaced guide pads with gaps therebetween. The pads guide a... | 10/09/1979 |
| 4019659 | Solids level indicator A solids-level indicator for small dissolving tanks including a transparent pipe secured on the top of the tank and a gauge member slideable in the transparent pipe and having a pad resting on the upper surface of the solid material. The transparent pipe ... | 04/26/1977 |
