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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 |
| 4305028 | System for evaluating the capability of a work-performing robot to reproduce a programmed series of motions A system for evaluating whether a work-performing robot can perform a series of programmed motions is disclosed which includes means for continuously comparing the velocity of the various links of a robot simulator, which is manually moved through the seq... | 12/08/1981 |
| 4298308 | Apparatus for detecting forces directing the movement of a manipulating instrument An apparatus attached to a motor driven manipulating instrument for detecting and identifying specific forces employed in moving the instrument along a predetermined spatial track. The apparatus includes a center portion rigidly attached to the manipulati... | 11/03/1981 |
| 4126818 | Hybrid stepping motor unit A hybrid stepping motor unit includes a stepper-type primary motor and a secondary motor. The rotor shafts of the stepper-type primary motor and the secondary motor are connected to a common output shaft. The stepper-type primary motor is energized in res... | 11/21/1978 |
| 4048547 | Torque responsive device The invention is a device for controlling and adjusting the tension in the cable of mooring winches or cranes by measuring the torque exerted on a speed reducer having at least one intermediate gear-train, constituted of a pinion and a larger toothed-whee... | 09/13/1977 |
| 3986090 | Motor drive for a part in an X-ray apparatus The servo drive according to the invention includes a force transducer which is disposed so as to sense all the forces which act on the image-forming section (the weight of the section, the manual force of the user, frictional forces and acceleration forc... | 10/12/1976 |
