Windmill
Patent 4649284 Issued on March 10, 1987. Estimated Expiration Date: 
February 7, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 7, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1111350 Windmill plant for generating energy Vertical axis wind turbine Patent #: 4245958 InventorApplicationNo. 06/699445 filed on 02/07/1985US Classes:290/55, Wind416/117Responsive to gravity or working fluid forceExaminersPrimary: Hix, L. T.Assistant: Brown, Brian W. International ClassesF03D 9/00 (20060101)F03D 7/06 (20060101) F03D 7/00 (20060101) AbstractA 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 mounted on the vertical transmission shaft, a sweeping cleaner formed on the lower portion of the transmission shaft to remove the snow or dirts on a power generator, a power generator formed on the lower end of the transmission shaft, and a high-speed braking clutch automatically braking the rotation of the transmission shaft under stronger wind pressure for safely protecting the power generator. | |
