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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 8171633 | Method for assembling a multi-segment wind turbine blade A multi segment wind turbine blade comprises at least two blade segments. A first blade segment comprises an outer skin, a bulkhead, and first alignment brackets removably coupled to the outer skin of the first blade segment. A first portion of a flange of the bulkh... | 05/08/2012 |
| 6939108 | Cooling fan with reinforced blade A circulatory device comprising a large diameter fan having reinforced fan blades with a tapered airfoil shape is disclosed. The fan blades may be formed using an extrusion method of fabrication, wherein each fan blade may comprise a reinforced trailing edge with a ... | 09/06/2005 |
| 6874228 | Propshaft assembly with vibration attenuation and assembly method therefor A shaft structure and at least two non-identical inserts. The shaft structure has a cavity and vibrates in response to the receipt of an input of a predetermined frequency such that at least two second bending mode anti-nodes are generated in spaced relation to one ... | 04/05/2005 |
| 5832605 | Methods for fabricating a helicopter main rotor blade A method for fabricating a helicopter blade subassembly includes the steps of providing a blade compaction apparatus having a lower assembly configured for mating with an upper assembly. The lower assembly includes a base having a contoured upper airfoil ... | 11/10/1998 |
| 5621967 | Method of making a leading edge weight retention assembly for a helicopter rotor A method for making helicopter rotor blades includes wrapping a prepreg strap around the conical or cylindrical outboard end of each weight segment. The weight segment is then placed in the rotor blade spar and goes through the spar cure cycle with it. Pr... | 04/22/1997 |
| 5401138 | System for fastening a hollow extruded blade for an axial-flow fan to the inserted shank of the blade A hollow extruded axial flow fan blade which includes two internal longitudinal reinforcing elements (ribs) perpendicular to the blade profile and in which are inserted through bolts for fastening the blade to a round supporting bar inserted longitudinall... | 03/28/1995 |
| 5248242 | Aerodynamic rotor blade of composite material fabricated in one cure cycle A rotor blade, whose principal structural components are of fiber-reinforced composite material, includes a spar, fairing skins, spar wraps, splices and doublers in the precured condition cut from rolls of raw stock into flat sheets having the dimensions ... | 09/28/1993 |
| 4524499 | Method of fabricating an aircraft propeller assembly with composite blades An adjustable pitch aircraft propeller has peripherally spaced composite blades each including an elongated core of expanded rigid foam material extending from a metal base member having a reduced neck portion and an outwardly projecting flange portion. A... | 06/25/1985 |
