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| Number | Title | Issue Date |
| 7959411 | In-pipe hydro-electric power system and turbine A generally spherical turbine configured to rotate transversely within a cylindrical pipe under the power of fluid flowing either direction therethrough is operatively coupled with a rotating machine or generator to produce electricity. In one embodiment, the blades... | 06/14/2011 |
| 7396208 | Divided blade rotor A novel rotor blade is presented with an integral tip portion from which two diverging blade portions extend to separated respective roots. The blade may have conventional airfoil sections, or may be made from flat or curved sheet material. The two rotor blade porti... | 07/08/2008 |
| 7156609 | Method of making complex twisted blades with hollow airfoil cross section and the turbines based on such A reactive turbine, each blade of which approximates a helical shape that is constructed with readily available conventional manufacturing techniques. The blades are constructed in discrete straight sections that, when joined, approximate a helix or any other effici... | 01/02/2007 |
| 7144222 | Propeller A propeller or propeller blade is manufactured using lattice block material to provide a structure which is generally hollow but for a three-dimensional lattice of support spars. The propeller or propeller blade, being predominately hollow, is substantially lighter ... | 12/05/2006 |
| 7126235 | Wind power electric device and method A wind-power unit has a wind turbine has an electric generator connected to the wind turbine. The stator of the generator has a winding formed of a high-voltage cable having a core of conducting material, a first layer of semiconducting material surrounding the core... | 10/24/2006 |
| 7084523 | Windmill for wind power generation A windmill for highly efficient wind power generation is provided by enabling one to efficiently rotate the windmill even in starting or at a low wind speed region by improving a blade of a vertical shaft type windmill of a lift type. In the windmill for wind power ... | 08/01/2006 |
| 7040859 | Wind turbine A wind turbine operable as either a vertical axis wind turbine or a horizontal axis wind turbine is disclosed. ... | 05/09/2006 |
| 7018167 | Fluid machinery An object is to improve the durability of wings and suppress vibration of the wings and generation of noise. A fluid machine includes a rotatably supported wing support, and a plurality of wings (21) formed on the wing support at a plurality of circumferentia... | 03/28/2006 |
| 7011497 | Shaft/hub unit for wind turbine rotor A rotor shaft/hub unit for a wind energy plant with a rotor shaft provided with a rotor bearing seat which is connected to a rotor hub provided with a blade or blade bearing connection, the rotor hub and rotor shaft are manufactured in one piece from bonded fiber fa... | 03/14/2006 |
| 6974309 | Straight wing type wind and water turbine A Straight blade type turbine has at least one two-dimensional blade positioned in parallel with and around a central axis of the turbine. The two-dimensional blade has a cross section with a blade chord turned around a center of the two-dimensional blade by an angl... | 12/13/2005 |
| 6840741 | Leading edge slat airfoil for multi-element rotor blade airfoils A leading edge slat for multi-element rotor blade applications which provide multiple benefits and provide design direction which has heretofore been unexplored. ... | 01/11/2005 |
| 6736600 | Rotor with a split rotor blade A rotor through which a fluid flows in a main direction of flow, provided with at least one rotor blade, the rotor blade being arranged to rotate about a rotor axis. The rotor blade extends away from the axis of rotation into the field. To reduce the trailed tip vor... | 05/18/2004 |
| 6099256 | Three dimensional figure eight propeller/impeller blade apparatus A propeller/impeller blade adapted to propel a vehicle or other device, create a vacuum, or move a medium, comprising a generally flat strip-like member having first and second opposite ends joined together to form a pair of contiguous loops with a genera... | 08/08/2000 |
| 6036443 | Helical turbine assembly operable under multidirectional gas and water flow for power and propulsion systems A helical turbine assembly capable of providing high speed unidirectional rotation under a multidirectional ultra low-head fluid flow is disclosed. The assembly comprises an array of helical turbine units or modules arranged, vertically or horizontally, t... | 03/14/2000 |
| 5890875 | Blade apparatus A three dimensional figure eight propeller/impeller blade apparatus is provided which may be used to propel a vehicle, power a shaft, create a vacuum, or move a medium. The blade apparatus is made from an elongated strip of generally flat material. In one... | 04/06/1999 |
| 5642984 | Helical turbine assembly operable under multidirectional fluid flow for power and propulsion systems A helical turbine assembly capable of providing high speed unidirectional rotation under a multidirectional ultra low-head fluid flow is disclosed. The assembly comprises an array of helical turbine units or modules arranged, vertically or horizontally, t... | 07/01/1997 |
| 5531567 | Vertical axis wind turbine with blade tensioner A Darrieus-type vertical axis wind turbine with tensioned blades is disclosed, along with various mechanisms for tensioning the blades. When the wind turbine is stationary in high wind conditions, the blades are tensioned to resist buckling. When the wind... | 07/02/1996 |
| 5419683 | Wind turbine A wind turbine for mounting on an existing industrial chimney (1), tower or the like, includes two vertically aligned blades (3) mounted on rotor arms (2) for rotation about the longitudinal axis of the chimney, tower or the like. The rotor arms are suppo... | 05/30/1995 |
| 5405246 | Vertical-axis wind turbine with a twisted blade configuration A vertical-axis wind turbine includes two or more elongated blades connected to a rotor tower. The tower defines an axis of rotation and is linked, preferably via a gearbox or other torque-converting arrangement, to the shaft of a generator. Each blade is... | 04/11/1995 |
| 5330325 | Agitating vane A plurality of flat plates are laterally disposed at an outer circumference of a hub and auxiliary vanes are disposed in parallel to at least side edges of each of said flat plates while being spaced apart from the side edges. Accordingly, an occurrence o... | 07/19/1994 |
| 5269647 | Wind-powered rotor The present invention relates to a rotor driven by wind power with a vertical rotating axis and radial arms distributed at uniform angular intervals over its periphery which bear bodies with an aerodynamic profile such that one side of the profile exhibit... | 12/14/1993 |
| 5252029 | Vertical axis wind turbine A Darrieus-type vertical axis wind turbine is disclosed which includes a vertically extending hollow rotor shaft mounted on a support structure with two, three, or four rotor blades of troposkein configuration on the rotor shaft for rotating the shaft in ... | 10/12/1993 |
| 5176501 | Propeller with an elastic sleeve A propeller system is formed on a shaft by at least one pair of axially spaced propeller blades each having a first and a second blade section extending at a selected acute (or obtuse) angle to the axis of the shaft, the first sections and second sections... | 01/05/1993 |
| 5171127 | Vertical axis sail bladed wind turbine A vertical axis turbine is provided which comprises a plurality of flexible sail blades attached to a vertically extending, rotatable shaft by upper and lower blade attachment devices, and a power absorbing load device coupled to the rotatable shaft. The ... | 12/15/1992 |
| 5161952 | Dual-plane blade construction for horizontal axis wind turbine rotors Dual-plant blade construction for wind turbine rotors having a horizontal shaft having a rotor hub adapted to be mounted on the horizontal shaft and having a horizontal axis. First and second sets of straight blades are secured to said rotor hub in circum... | 11/10/1992 |
| 4648312 | Apparatus for ventilating an enclosed area An apparatus for ventilating an enclosed area comprised of a hemispherical dome-like head assembly covering an exit hole to an enclosed area to be ventilated, an external wind driven fan, and high efficiency internal exhaust fan blades adjacent to the exi... | 03/10/1987 |
| 4636143 | Propeller for gaseous and fluidic media A propeller for gaseous and fluidic media, particularly an air propeller which is formed with at least one vane mounted to a hub of the propeller and rotatable about a central axis of the propeller. The vane includes two blades extended in the radial dire... | 01/13/1987 |
| 4624624 | Collapsible vertical wind mill A collapsible vertical wind mill is disclosed, which comprises four main wings arranged in a rhombic form having a pair of opposed corners fitted on a shaft and auxiliary wings each provided on each of the main wings. The upper one of the pair corners on ... | 11/25/1986 |
| 4610601 | Method of making axial fan impeller The axial fan produced by the novel method may have a cylindrical shroud, an impeller mounted coaxially within the shroud, and a bell-shaped deflector extending across the exhaust to redirect the airflow toward radially outward directions. A malleable bla... | 09/09/1986 |
| 4575311 | Gear box assembly-upper head assembly An upper head assembly for the top of a wind turbine comprising a guy wire coupling vertically displaceable by fluid below the coupling.... | 03/11/1986 |
| 4553037 | Solar breeze power package and saucer ship A solar breeze power package having versatile sail and windmast options useful both on land and sea and especially useful in the saucer ship type design. The Vertical Axis Wind Turbine (VAWT) of the several Darrieus designs in conjunction with roll-up or ... | 11/12/1985 |
| 4545726 | Turbine A turbine which rotates in the same directional sense for both directions of throughflow of a working medium contains rotor blades possessing an aerofoil-shaped profile which at least over a portion of the length of the rotor blades is subdivided into pro... | 10/08/1985 |
| 4543042 | Windmill rotor A windmill rotor of the vertical axis type having at least three main blades mounted symmetrically around a shaft and bowing outwardly to define a generally sphere-like chamber. Each main blade has a secondary blade mounted on its inner surface, and the s... | 09/24/1985 |
| 4525911 | Method and apparatus for attaching blades to rotating structures A method and apparatus for attaching blades to a rotating structure where the blades are clamped by blocks at the leading and trailing edges then to an intermediary member which is attached to the rotating structure.... | 07/02/1985 |
| 4504192 | Jet spoiler arrangement for wind turbine An air jet spoiler arrangement is provided for a Darrieus-type vertical axis wind-powered turbine. Air is drawn into hollow turbine blades through air inlets at the ends thereof and is ejected in the form of air jets through small holes or openings provid... | 03/12/1985 |
| 4500257 | Wind turbine spoiler An aerodynamic spoiler system for a vertical axis wind turbine includes spoilers on the blades initially stored near the rotor axis to minimize drag. A solenoid latch adjacent the central support tower releases the spoilers and centrifugal force causes th... | 02/19/1985 |
| 4449053 | Vertical axis wind turbine A Darrieus-type vertical axis wind turbine is disclosed which includes a vertically extending rotor tube mounted on a support structure with two or three rotor blades of troposkein configuration on the rotor tube for rotating the tube in response to wind ... | 05/15/1984 |
| 4445817 | Propeller construction A propeller formed from pliable sheet material with each blade being of looped configuration in plan view. An end segment of each blade is turned inwardly and attached to an inner segment of an adjacent blade at a point offset from the propeller hub porti... | 05/01/1984 |
| 4422825 | Controlled wind motor A mechanical sail including a rotatable mast, the mast including a top vane mount and a bottom vane mount, the mounts being spaced from each other on the mast and rotatable therewith, a series of rotatable vanes spaced from and surrounding the mast and su... | 12/27/1983 |
| 4392785 | Pump control system for windmills A windmill control system having lever means, for varying length of stroke of the pump piston, and a control means, responsive to the velocity of the wind to operate the lever means to vary the length of stroke and hence the effective displacement of the ... | 07/12/1983 |
