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| Number | Title | Issue Date |
| 7988416 | Wind turbine blade with damping element A blade for a wind turbine generally comprises a shell body defined by first and second shells extending between a leading edge and a trailing edge, an inner spar supporting at least a portion of the shell body, and a damping element coupled to at least one of the s... | 08/02/2011 |
| 7311496 | Apparatus and method for generating electric energy in a fluid environment Apparatus for generating electrical energy in a fluid environment, the apparatus including a wing member for disposition in the fluid and pivotally movable about an axis in response to flow of the fluid thereabout, connector rods each pivotally mounted at a first en... | 12/25/2007 |
| 7220104 | Vibration reduction system for a wind turbine A wind turbine includes a tower, a nacelle supported at an upper end of a tower, a rotor having at least one blade and being arranged at the nacelle, and a vibration load reduction system disposed at either the tower or the nacelle. The vibration load reduction syst... | 05/22/2007 |
| 6840476 | Resonant wingbeat tuning circuit using strain-rate feedback for ornithoptic micro aerial vehicles A resonant wingbeat tuning circuit automatically tunes the frequency of an actuating input to the resonant frequency of a flexible wing structure. Through the use of feedback control, the circuit produces the maximum flapping amplitude of a mechanical ornithoptic sy... | 01/11/2005 |
| 6626642 | Wind turbine blade with u-shaped oscillation damping means A wind turbine blade has an oscillation damper provided in the blade for damping oscillations of the blade, in particular edgewise oscillations of the blade in the rotational plane of a rotor on which the blade is mounted. The damper comprises a U-shaped ... | 09/30/2003 |
| 6273680 | Extraction of energy from flowing fluids Method and apparatus for converting the kinetic energy of a moving fluid stream into useful work by using a cascade of thin aero or hydro foils positioned therein. The foils may be provided with at least two degrees of freedom and adjacent foils move out ... | 08/14/2001 |
| 6153944 | Apparatus for generating electricity from flowing fluids An apparatus for generating electricity from aeolian oscilaltions caused by the flow of a fluid such as wind or water. An immobile beam extends between two piers, and a movable vane is disposed around the beam in parallel relation thereto. The vane is gen... | 11/28/2000 |
| 5931056 | Fan device with adjustable rotary-angle A fan actuator device with an adjustable rotary angle having an upper connector rotated by a motor gear, a toggle mechanism formed by an upper connecting rod, a lower connecting rod and a coupling connector, a swinging arm connected to the coupling connec... | 08/03/1999 |
| 5899408 | Ornithopter An ornithopter aircraft which flys by flapping a wing. The wing is flapped by a constructively sympathetically forced dampened harmonic oscillation induced in a leading edge strut which preferable is a single flexible steel rod extending the length of the... | 05/04/1999 |
| 5324169 | Oscillating, lateral thrust power generator An apparatus for power production from low velocity fluid flow includes a lateral support arm assembly extending from a vertical drive shaft. A power blade is pivotally secured to the distal end of the support arm, and constrained to pivot within a define... | 06/28/1994 |
| 5217417 | Device for controlling the sweeping-angle of a fan A device for variable control of the sweeping angle of a fan which includes a worm gear cooperating with a planet gear and a sun gear to provide variable sweep angle with a clutch mechanism to allow for the disengagement of the drive mechanism while varyi... | 06/08/1993 |
| 5054376 | Electric ceiling fan An assembly can be anchored on a ceiling or a beam and includes a motor, preferably electrical, and a velocity demultiplexer formed by pulleys or by gear systems which transmits the motor driving force to an arm or arms of a fan member which has an axis c... | 10/08/1991 |
| 5009571 | Wind motor A machine for extracting useful work from lowspeed winds includes a sail (28) pivotally mounted to an arm (22) for pivotal motion about a first axis (32), and a base (18) to which the arm (22) is pivotally mounted for pivotal motion about a second axis (2... | 04/23/1991 |
| 4595336 | Wind powered apparatus An elevated and elongated boom is centrally pivoted for rocking movement in a vertical plane through the horizontal plane. Provision is made to align such plane with the direction of the wind. A pair of free wings are mounted on the fore and aft ends of t... | 06/17/1986 |
| 4476397 | Energy conversion apparatus Apparatus for converting fluid energy into mechanical energy may include a sail and a mast carried by a pivotally mounted support. The sail is mounted both directly to the mast and indirectly to the mast through a boom, which is pivotally mounted at its center... | 10/09/1984 |
| 4470770 | Wind powered apparatus An elevated and elongated boom is centrally pivoted for rocking movement in a vertical plane through the horizontal plane. Provision is made to align such plane with the direction of the wind. A pair of free wings are mounted on the fore and aft ends of t... | 09/11/1984 |
| 4347036 | Fluid energy converting method and apparatus There is disclosed a method and apparatus for converting the kinetic energy of a moving fluid stream into useful work by means of a cascade of thin airfoils positioned therein. In one embodiment, the airfoils are provided with at least two degrees of free... | 08/31/1982 |
| 4332571 | Wave motors There is disclosed an improvement in wave motors for propulsion of boats, of the type comprising a supporting structure connected to the boat and extending downwards into the water, and a tilting element connected to the supporting structure, the tilting ... | 06/01/1982 |
| 4148619 | Flask and mechanical aerator An aerator for use in the neck of a flask for increasing the flow of gas from the exterior to the interior of the flask. The aerator has a gas-impervious exterior wall a plurality of gas moving members are positioned within the wall and tend to urge gas t... | 04/10/1979 |
| 4089846 | Polysalts of acid-ester compounds with hydrazine or hydrazides and method of preparing heterocyclic polymers from said polysalts Novel polymers formed from the reaction of tricarboxylic anhydrides and hydrazines or hydrazides which may be cross-linkable by further reaction with a hydrazine or hydrazide are disclosed.... | 05/16/1978 |
| 3995972 | Wind machine with reciprocating blade means An apparatus is provided for converting an air flow into useful mechanical work by means of a reciprocating blade means. The preferred blade means comprises a plurality of lightweight, airfoil shaped blades mounted in a stack for moving a carrier associat... | 12/07/1976 |
| 3945769 | Self-oscillating fan A fan having a single degree of freedom to torsionally oscillate in a horizontal plane which in one version oscillates about a fixed vertical axis, self-excited by an aerodynamic couple created by feathering vertically disposed vanes which are symmetrical... | 03/23/1976 |
