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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 |
| 5513969 | Rotary piston machine having engaging cycloidal gears The invention comprises a rotary piston machine, which functions as a pump, compressor or engine, and in which the cogs (45) of teeth (46) of a rotating control part travel over a cycloidal surface (44) of a cycloidal part (42) in order to define work cha... | 05/07/1996 |
| 5460557 | Swim fin A swim fin (1) for divers or swimmers, having a freely leading profile (7) as the fin blade, which always has a positive angle of attack on both the upwardly (II) and the downwardly (I) oriented stroke of the fin with respect to the oncoming flow directio... | 10/24/1995 |