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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 |
| 6666575 | Balance wheel provided with an adjustment device The balance wheel, particularly for a timepiece movement, provided with an adjustment device of its inertia to adjust its frequency of oscillation, comprises a rim (1) of circular shape, free from projecting portions, connected by radial arms (2) to a hub... | 12/23/2003 |
| 6329066 | Self-compensating spiral for a spiral balance-wheel in watchwork and process for treating this spiral This self-compensating spiral for a mechanical spiral balance-wheel oscillator in watchwork or other precision instrument, made of a paramagnetic alloy, contains at least one of the elements Nb, V, Ta, Ti, zr, Hf and is covered with a substantially unifor... | 12/11/2001 |
| 4340948 | Single-coil balance wheel for driving a mechanical movement A timepiece including a mechanical movement is disclosed and a movable system for driving the movement. The movable system includes a balance wheel formed by a pair of plates and a magnetic member mounted on each plate. The magnetic members include a magn... | 07/20/1982 |
| 3961209 | Oscillator for time measurement This invention concerns an oscillator for time measurement, comprising a resonator the oscillation of which is maintained by at least one part reciprocated by electrostatic forces relative to at least one electrode connected to a direct voltage source, sa... | 06/01/1976 |
