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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 |
| 7350593 | Electronically controlled earth drilling rig An electronic control, for automated earth drilling using a pneumatic hammer-operated bit, preliminarily weighs a drill string, and, during drilling, automatically maintains a desired weight on the bit, and also maintains a constant rate of drilling progress by regu... | 04/01/2008 |
| 5941324 | Drilling apparatus A mobile rig for angle drilling comprises a tiltable drilling mast and a drill pipe storage rack both mounted on a land vehicle, with a carriage movable lengthwise on a track extending alongside the mast. When the mast is in an oblique position for angle ... | 08/24/1999 |
| 4277341 | Water treatment discharge means A lagoon for wastewater treatment, having an aeration zone and a quiescent zone is provided with a collector in the form of a horizontally extending submerged tube filled with biological reaction media and having an array of openings on its underside for ... | 07/07/1981 |
| 4048072 | Air diffusers A radial configuration of flexible diffuser tubes eliminates short-circuiting by automatically producing a flow pattern extending well beyond the radial extent of the diffuser. A slitted diaphragm at the outer end of a diffuser tube facilitates the remova... | 09/13/1977 |
| 3966854 | Air trap An air trap for removing accumulated water from a system for producing air bubbles in which the elongated conductor which has air supplied thereto from the compressor and which has openings through which air passes to produce the bubbles has an air trap c... | 06/29/1976 |
