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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7239038 | Apparatus for electrical signal generation based upon movement and associated methods A generator/sensor may include a pair of arcuate swing arms having respective opposing ends pivotally carried by a base so that the arcuate swing arms are transverse to one another and define a movable crossing point therebetween. A body may be carried by the arcuat... | 07/03/2007 |
| 7153022 | Solar powered rainbow maker A crystal display device is disclosed wherein a vertically arranged photovoltaic cell, main device housing—encasing an electric motor and transmission—, and a refractory crystal suspended below is rotated so as to provide multi-colored displays upon room walls a... | 12/26/2006 |
| 6250798 | Solar crystal motion device This device projects slow moving light beams on the shadowed regions of a windowed room when the sun shines through the window. It includes a crystal-set (9) directly suspended from the bottom of a vertical rotor (14) of a motor (2) by a thread-like membe... | 06/26/2001 |
| 5717660 | Rotary decoration driving device A rotary decoration driving device comprises a case, a first rotary shaft having a first end portion rotatably supported by the case and a second end portion supporting a first decoration for rotation therewith. A second rotary shaft is mounted on the fir... | 02/10/1998 |
| 5535178 | Adjustable suspension fork A suspension fork for a 400-day anniversary clock is disclosed. The suspension fork includes a main fork and a tuning fork interconnected by an adjustment mechanism to permit easy and precise adjustment of the beat of the clock. The main fork includes a p... | 07/09/1996 |
| 5425005 | Drive unit for a rotary decoration A drive unit for a rotary decoration has a transmission gear train configured to include a damper such as a coil spring and is capable of imparting a visually elegant swing motion to the rotary decoration. A reciprocating stepping motor is capable of rota... | 06/13/1995 |
| 4791621 | Solar cell powered clock having a decorative pendulum A solar powered electric clock of the type configured as a traditional 400-day clock with a torsional pendulum includes a housing in which the clockworks, dial face and hands are disposed. The housing is supported over a base by means of vertical columns.... | 12/13/1988 |
| 4745590 | Anniversary clock with glass case A prismatic glass or transparent synthetic resin case for a clockwork on a base of an anniversary clock is provided on at least some of its planar facets with a decor whose resistance to peeling is ensured by the planarity of the facets to which the decor... | 05/17/1988 |
| 4737943 | Friction coupling for clockworks A clockwork having a decorative torsion pendulum and a star wheel connected to a drive shaft of the clockworks by a friction coupling wherein a follower needle connected to the torsion spring of the torsion pendulum crosses the path traveled by the spokes... | 04/12/1988 |
| 4482260 | Electromechanical clock A timepiece, with a clockwork driven by a stepping motor, has a clockwork-supporting structure with front and rear uprights, generally of hourglass shape, each constituted by a pair of mirror-symmetrical coplanar strips defining its contour, the front upr... | 11/13/1984 |
| 4395137 | Synchronizing system for oscillating mechanism A method and apparatus for accurately controlling a timekeeping apparatus utilizing a relatively heavy free pendulum or other harmonic structure carrying a permanent magnet, and a powered harmonic structure carrying a ferromagnetic element. The magnet is ... | 07/26/1983 |
| 4308606 | Clock with rotary pendulum A rotary pendulum without time-keeping function, comprising an inertial body suspended from a clockwork housing of a preferably electronically driven timepiece through the intermediary of an elongate torsion spring, is periodically accelerated by the impa... | 12/29/1981 |
| 4203282 | Electric pendulum clock with torsion spring An electrical pendulum clock comprising a clock movement having a driven shaft and a dummy pendulum driven from the shaft independently of the timekeeping function of the clock. The pendulum comprises a torsion spring with a vertical axis of twist and a p... | 05/20/1980 |
| 3990226 | Electromechanical clock A timepiece with an electrodynamically controlled clockwork has a torsion ndulum intermittently coupled through a gear train with the clockwork for the maintenance of its oscillations. The gear train includes a first pinion mounted on a weighted rocker te... | 11/09/1976 |
| 3986336 | Improvement in or for a torsion pendulum clock In or for a torsion pendulum clock, a mechanism for limiting the rotation of the torsion pendulum to a predetermined arc to protect the spiral spring.... | 10/19/1976 |
