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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 |
| 6349791 | Submarine bow dome acoustic sensor assembly A submarine bow dome acoustic sensor assembly comprises an outer hull bow portion, an inner pressure hull wall extending athwartships and in conjunction with the outer hull bow portion defining a free-flood compartment, and an acoustic bow panel disposed ... | 02/26/2002 |
| 6341661 | Bow dome sonar A compact, modular sonar assembly for use on the bow of a ship having separate transmitting and receive arrays confined within a single acoustic housing. The narrow and compact design fits much better into the hydrodynamically desirable bulbous bow deign ... | 01/29/2002 |
| 5532980 | Vibrational anti-fouling system An anti-fouling system for producing vibrations in an underwater structure to inhibit the attachment of aquatic life forms to the structure. The system includes a controller which drives one or more transducer. The transducer comprises a housing, one end ... | 07/02/1996 |
| 5507178 | Liquid presence and identification sensor A sensor for determining both the presence of a liquid in a container or conduit, and identifying its type has a sensor housing body containing both a pair of piezoelectric elements used as the transmitter and receiver of ultrasonic waves directed across ... | 04/16/1996 |
| 5426619 | Matched array plate An array plate for use in an underwater craft. The craft having an array of sonar elements which has a selected range of operating frequencies. The array plate having at least one layer of material in which the layer(s) of material are designed to have se... | 06/20/1995 |
| 5353263 | Soft sonar suspension system An underwater transducer assembly (T or P) is mounted on an elongated cylindrical piston (32 or 90) received in a pneumatic cylinder (31 or 91). One or more springs (41 or 92) normally bias the piston (32 or 90) inward into the cylinder (31 or 91) to retr... | 10/04/1994 |
| 5130948 | Method and apparatus for reducing acoustic emission from submerged submarines A method and an apparatus are disclosed serving to reduce acoustic emission from submerged submarines in which vibrations from moving mechanical elements within an inner region are transmitted to an outer hull via a vibration transmission path. For decoup... | 07/14/1992 |
| 4934478 | Contact sensing apparatus and method A sensing apparatus capable of delivering a control signal in response to contact between an element of the apparatus and an external object should respond readily to a predetermined level of contact, and should be sensitive along all portions of the cont... | 06/19/1990 |
| 4912464 | Anchor alarm for boats and the like A motion detector is physically attached to a boat's anchor. Upon abnormal motion or movement of the anchor, indicative of a dragging anchor, a pulse generator is initiated by the motion detector to actuate a transmitting transducer and generate an acoust... | 03/27/1990 |
| 4831599 | Float for use in seismic surveys of the sea bed A float for use in seismic surveys of the sea bed supports a plurality of seismic pulse transmitters (6) which are suspended on lines (7) beneath the float (1). At a distance from the front end of the float (1), on one sidewall thereof, a fastening device... | 05/16/1989 |
| 4737940 | Trolling motor with sonar transducer An assembly is provided for mounting a sonar depth sounder transducer on an electric trolling motor such that the transducer is protected from entaglement with vegetation and from being knocked out of a predetermined orientation relative to the boat. The ... | 04/12/1988 |
| 4716553 | Float for use in seismic surveys of the sea bed A float for use in seismic surveys of the sea bed supports a plurality of seismic pulse transmitters (6) which are suspended on lines (7) beneath the float (1). At a distance from the front end of the float (1), on one sidewall thereof, a fastening device... | 12/29/1987 |
| 4400805 | Acoustically filtered transducer Disclosed is an acoustic transducer which includes a pressure tight vessel with a window in the vessel which is transparent to acoustic wave energy. A gas is disposed within the vessel, while an electromechanical transducer is located within the vessel at... | 08/23/1983 |
| 4152392 | Chemical canister 1. A chemical canister for generating gas in a noisemaker beacon comprising canister case for holding a chemical for generating a buoyant gas, a canister cover adapted to be mounted on said case, a watertight seal between said cover and said case, means f... | 05/01/1979 |
| 4039767 | Acoustic emission transducer calibration A method of calibrating acoustic emission transducers. The sensitivity of a standard transducer is first determined utilizing a reciprocity calibration technique, and the standard transducer and the acoustic emission transducer are then connected to a bou... | 08/02/1977 |
| 3951231 | Seismic exploration A marine acoustic seismic generator carried on the deck of a boat is coupled to a body of water in which the boat floats by a column of water in a pipe extending between the generator and the body of water. Post explosion oscillations are damped or termin... | 04/20/1976 |
