Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 5726442 | Opto-electronic scale reading apparatus having light-transmissive phase-encoding array of elongate spectral encoding elements An opto-electronic scale reading apparatus includes a reflective scale (410) relative to which a readhead is movable. The readhead includes a light source in the form of the emission end of an optical fiber (300), which directs light via collimating lens ... | 03/10/1998 |
| 5016199 | Co-ordinate measuring A co-ordinate measuring machine has a probe (62) used to touch points on an article (61) under manual control by a user, e.g. from a joystick (69). A computer (71) determines a vector describing the direction of probe movement prior to touching each point... | 05/14/1991 |
| 4879462 | Opto-electronic scale-reading apparatus having spatial filter for wavelength separation The invention provides an opto-electronic scale reading apparatus wherein a read head comprises a lens adapted to project a beam of collimated light through a spatial filter on to a scale having lines. Light reflected from the scale passes back through th... | 11/07/1989 |
| 4875177 | Datuming of analogue measurement probes An optical analogue probe (9) is used on a co-ordinate measuring machine (1). Prior to use, it is datumed to compensate for any misalignment of the angle (θ) of its measurement axis (12A) from each of the machine's axes (X,Y,Z). Trigger points (D2,D3) ar... | 10/17/1989 |
| 4864230 | Processing quadrature signals Quadrature input signals from an opto-electronic or magnetic readhead which is movable relative to a periodically marked scale, are respectively multiplied by quadrature reference signals from a reference oscillator in multipliers. The resulting signals a... | 09/05/1989 |
| 4758787 | Processing quadrature signals A frequency-to-voltage converter, as applied to controlling the speed of a motor, comprises: a motor speed encoder (1) producing first and second alternating signals (3a,3b) each at the same, first frequency which frequency is dependent on the said speed,... | 07/19/1988 |
| 4663823 | Machine tool In a machine tool having a spindle supporting a work holder, means are provided for automatically operating the work holder to grip or release a workpiece and for automatically securing the work holder to the spindle or release it therefrom. Within the sp... | 05/12/1987 |
| 4646422 | Machine tool A numerically controlled machine tool capable of milling and turning operations has a continuously rotatable first spindle (10) to which is releasably secured a work holder (50). A rotationally positionable second spindle (20) has releasably secured there... | 03/03/1987 |
