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| Number | Title | Issue Date |
| 5075564 | Combined solar and wind powered generator with spiral surface pattern A combination solar and wind powered generator including a wind generator, responsive to the flow of air currents, for converting mechanical energy into electrical energy. The wind generator includes a plurality of air engaging vanes which are rotatably s... | 12/24/1991 |
| 5057696 | Vertical windmill with omnidirectional diffusion A vertical windmill employing aerodynamic lift includes stators that form an omnidirectional diffuser and can rotate out of the wind to reduce the destructive tendencies in high winds. A braking mechanism included in the windmill uses rotation of the airf... | 10/15/1991 |
| 5038049 | Vertical axis wind powered generator An apparatus for generating electric power from wind includes a base, a pair of upstanding, generally parallel, spaced apart walls rotatably mounted on the base and defining an inlet end and an outlet end for wind, an electric power generator mounted on t... | 08/06/1991 |
| 4994684 | Doubly fed generator variable speed generation control system Disclosed is a device and method to control the conversion of an arbitrary resource energy into mechanical energy and subsequently into electric energy with a variable-speed generation system utilizing a turbine and a doubly-fed generator, to be connected... | 02/19/1991 |
| 4970404 | Method and means of generating electricity by a wind blown turbine A method of generating electricity by a wind blown turbine comprising mounting a generator aramture rigidly on a shaft; rotatably mounting a housing, a field coil and a wind turbine with respect to the shaft; electrically connecting the field coil through... | 11/13/1990 |
| 4963761 | Wind-driven power generator A wind-driven power generator comprises a substantially horizontal roof including upper and lower roof members each having a peripheral edge and a contoured pressure reducing surface. The roof members are disposed in a spaced-apart relationship with the p... | 10/16/1990 |
| 4945693 | Concentric dome energy generating building enclosure This invention the concentric dome energy generating building enclosure makes possible the passive transfer of renewable energy from the wind and the sun into mechanical and/or electrical energy. This invention provides the means for moving thermal and/or... | 08/07/1990 |
| 4935639 | Revolving power tower A revolving power tower comprising a fixed tower and a revolving tower, to make use of wind power as main power source and the heat energy of the sun as supplementary power source, said revolving tower being to induce the wind from all directions to run i... | 06/19/1990 |
| 4926061 | Windtrap energy system A windmill of two designs, both aesthetically acceptable and operational without noise pollution, having a rotatable vertical shaft with either three or four windtraps consisting of a pair of concave vanes. These vanes are attached by welding to both the ... | 05/15/1990 |
| 4917332 | Wingtip vortex turbine A means for extracting rotational energy from the vortex created at aircraft wing tips which consists of a turbine with blades located in the crossflow of the vortex and attached downstream of the wingtip. The turbine 30 has blades 40, 41, 42 and 43 attac... | 04/17/1990 |
| 4894554 | Cable suspended windmill A windmill includes an airframe having an upwind end and a downwind end, a first rotor rotatably connected to the airframe, and a generator supported by the airframe and driven by the rotor. The airframe is supported vertically in an elevated disposition ... | 01/16/1990 |
| 4871923 | Wind power device A wind power device comprises a rotor, a machine for converting wind energy, a transmission for transmitting a rotary movement of the rotor to the machine, a tower formed so that the rotor, the transmission and the machine are arranged on the tower, a hou... | 10/03/1989 |
| 4857753 | Wind energy convertor In a vertical axis wind generator incorporating a circular turbine supported by an uppermost part of an upstanding support, a stator surrounding and coaxial with the turbine comprises an upper annular body positioned adjacent and or above the upper end of... | 08/15/1989 |
| 4832569 | Governed vane wind turbine Wind energy converting machine comprising a solid rotating ring carrying airfoils which are governed to have an optimal angle of attack to the wind approaching each of them when the wind velocity is below a chosen limit. In stronger wind the angles of att... | 05/23/1989 |
| 4818888 | Water-powered electricity generating apparatus Water-powered electricity generating apparatus, for use in rivers and other bodies of water having current flow therein, comprises a water wheel and an adjacent platform. The water wheel has a number of blades which are pivotally attached adjacent a first... | 04/04/1989 |
| 4805329 | Self-powered computerized advertisement board A self-powered computerized advertisement board is disclosed which utilizes a plurality of wind-driven illuminating units to provide the requisite electrical power. The invention includes an electrical power handling circuit and a control circuit to store... | 02/21/1989 |
| 4801811 | Method of and means for generating electricity in an arid environment using elongated open or enclosed ducts Electricity is generated in an arid environment using an open duct such as a canyon that is closed at one end and open at the other by erecting an air dam at the open end of the canyon and locating an air turbogenerator in the base of the dam. The air in ... | 01/31/1989 |
| 4792700 | Wind driven electrical generating system A wind driven electrical generating system consisting of a post with guyed cable supports, a spinner cage mounted on a square wheel on a circular race, sail elements on the spinner cage, a swash plate mounted upon under side of spinner cage and providing ... | 12/20/1988 |
| 4779006 | Hybrid solar-wind energy conversion system A system for producing electrical energy including a stack shaped and positioned generally as the letter "J" and having an intake portion, an exhaust portion and a conveying portion therebetween together with a vacuum producing mechanism associated with t... | 10/18/1988 |
| 4767939 | Wind driven electric current producer A wind-driven electric current-producer has a magnetic field producing alternator rotor directly driven by an air turbine blade. The alternator and blade together are mounted on a vertically tiltable control frame which is pivotably mounted on a main fram... | 08/30/1988 |
| 4764313 | Air driven water circulation mill A flotation platform supports a mast assembly through which a drive shaft extends having a wind driven turbine on the upper end and a propeller on the lower end situated below the water surface. The propeller is rotated by the wind turbine and causes loca... | 08/16/1988 |
| 4764683 | Wind powered electric generator An improved wind powered generator includes a streamlined housing rotatably connected with a fixed base and a pair of helical rotors rotatably connected with the housing for driving a pair of electric generators when the rotors are rotated by the wind. Th... | 08/16/1988 |
| 4757211 | Machine for generating electricity In order to construct windmills with high capacity the machinery need to be constructed and dimensioned in such a manner that any type of damage to the machinery is avoided. This is best ensured by a hub construction, which according to the invention comp... | 07/12/1988 |
| 4748339 | Wind turbine operated electrical generator system A wind turbine operated electrical generator system, said system comprising a wind turbine of the axial flow type, the blades of the turbine including tip portions pivoted with respect to the remainder of the blade, a generator driven by the wind turbine ... | 05/31/1988 |
| 4735382 | Space craft cellular energy generating and storage device A space craft cellular energy generating and storage device for generating electrical power in space and storing the power for extended periods of time. The space craft generating and storage device characterized by having a pair of annular rotating housi... | 04/05/1988 |
| 4730119 | Sail-driven wind motor A sail-driven wind motor (SDWM) is described, in which a reciprocating load amenable to intermittent, bidirectional drive (such as a water pump or air compressor) is driven by one or two arms, with each arm driven by at least one conventional fore-and-aft... | 03/08/1988 |
| 4708592 | Helicoidal structures, useful as wind turbines A collapsible structure comprising a non-rigid helicoidal sheet braced by light-weight members according to one of several methods. The structure is used in the construction of a wind turbine, wherein a flexible fabric sheet (21) is reinforced by wires (4... | 11/24/1987 |
| 4707617 | Windmill apparatus A windmill apparatus includes: a frame body structure adapted to be positioned on a flat top of a construction; a main shaft vertically installed in the middle of the frame body structure; a first main-shaft sleeve rotatably coupled with a lower part of t... | 11/17/1987 |
| 4703189 | Torque control for a variable speed wind turbine Apparatus and method for controlling a variable speed wind turbine-generator at improved efficiencies is disclosed. The method and apparatus of the invention control the rotor tip speed below the limiting torque of the wind turbine at a selected constant ... | 10/27/1987 |
| 4700081 | Speed avoidance logic for a variable speed wind turbine A variable speed wind turbine is controlled in a way which avoids the turbine lingering at a critical speed which would otherwise tend to cause excessive vibration. The disclosed method and apparatus increases speed at a selected rate with respect to gene... | 10/13/1987 |
| 4695736 | Variable speed wind turbine A variable speed wind turbine includes a frequency converter which converts variable frequency AC from a turbine driven AC generator to fixed frequency AC for delivery to a power grid. The frequency converter is typically an electronic cycloconverter or r... | 09/22/1987 |
| 4692631 | Turbine alternator with a central clear optical path A turbine alternator comprising a central clear optical path through which certain objects or optics may pass unimpeded. This design features a means for internal safe arming of the munition in which the turbine alternator is contained. In addition, this ... | 09/08/1987 |
| 4684817 | Valvular sail power plant A windmill generally intended to rotate in a horizontal plane about a vertical axis, includes essentially radial vanes; each which is effectively a one way valve respective to air flow; each which can enhance (or supplement) the beneficial actions of the ... | 08/04/1987 |
| 4678923 | Windmill A windmill for generating electricity in which each blade of the air-screw is connected to the hub by means of at least two resilient strips which are oppositely inclined both in the plane of rotation of the blade and in a plane extending through the rota... | 07/07/1987 |
| 4673822 | Wind electric generator Wind mill blades are mounted on spokes provided on a power shaft via springs, and thereby in an ordinary wind velocity the wind mill blades are adjusted into a prescribed angle, while in a storm they are made parallel to the direction of a wind, thus enab... | 06/16/1987 |
| 4659940 | Power generation from high altitude winds There are disclosed method and apparatus for the production of electrical power from high altitude winds. A kitecraft (12) secured to a ground tether (14) supports a cylindrical drum (10) rotatable about a horizontal shaft (60). The drum comprises a plura... | 04/21/1987 |
| 4656362 | Blade pitch angle control for large wind turbines A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 a... | 04/07/1987 |
| 4651017 | Wind energy conversion system The wind energy conversion system includes a wind machine having a propeller connected to a generator of electric power, the propeller rotating the generator in response to force of an incident wind. The generator converts the power of the wind to electri... | 03/17/1987 |
| 4649284 | Windmill A windmill includes a supporting frame, a vertical transmission shaft rotatably mounted in the supporting frame, a plurality of fan blades, each having two bending edges longitudinally formed on the two vertical edges of the blade, horizontally pivotedly ... | 03/10/1987 |
| 4641039 | Wind motors and aerogenerators An aerogenerator or wind motor comprises a variable pitch propeller rotor. It comprises compensation means (13) which are sensitive to the deceleration of the rotor to automatically exert on each blade (3), in case of deceleration of the rotor, a force wh... | 02/03/1987 |
