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...that "patent leather" got its name because the process of applying the polished black finish to leather was once patented?
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| Number | Title | Issue Date |
| 4078197 | Proportional control for guidance system A guidance system for seeking, following, and maintaining the position of a welding apparatus with respect to a seam or joint to be welded by sensing changes in the surfaces, hereinafter called reference surfaces, at or adjacent to the seam. The system in... | 03/07/1978 |
| 4034275 | Optical control system for elevators A reduction in speed of a movable member is sensed by an R. C. time delay circuit including light activated silicon controlled rectifiers which are respectively activated by light beams sequentially applied thereto at the rate of movement of said movable ... | 07/05/1977 |
| 4031441 | Optical encoder An optical encoder comprises a housing capable of being clamped in an end wall of a motor or rotating component about its shaft, a shaft opening in the housing, a fixture for mounting an optical encoding disc firmly in an end portion of the shaft when pro... | 06/21/1977 |
| 4027217 | Speed control for a motor The spindle motor for a flexible recording disk is connected to a disk with an annular track of optical markings which are scanned to derive therefrom a train of reset pulses for a counter counting higher frequency clock pulses. Reaching of a particular c... | 05/31/1977 |
| 4021711 | Article positioner with zero position sensing means An article handler or positioner includes an X-Y table driven by reversible stepping motors. Zero position sensors function to provide an output signal when the X-Y table moves into a zero or home or reference position. The sensors are electro-optical dev... | 05/03/1977 |
| 4019606 | Elevator system An elevator system including an elevator car mounted in a structure to serve the landings therein, and an opto-electronic position detector for determining when the elevator car is within a predetermined distance from a selected landing. The position dete... | 04/26/1977 |
| 4002960 | Torque controlled tapping device A threading and/or tapping device has a housing including a tubular portion and a chamber portion that provides a shelf for a motor. A shaft rotatably connected to a slide within the tubular portion extends downwardly through the chamber portion with a to... | 01/11/1977 |
| 3966088 | Leak detection apparatus A leak detection apparatus for a dispensing apparatus having a pump and a pressure-sensing apparatus with an output switch responsive to a predetermined pressure has a pump interrupter circuit with a control input. A pump interrupter control circuit has a... | 06/29/1976 |
