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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 |
| 4694124 | Digitizing tablet system including a tablet having a grid structure made of two orthogonal sets of parallel uniformly sized and spaced U shaped loops of conductive material A digitizing tablet system having a stylus which is inductively coupled to a grid is disclosed. The grid includes a first plurality of narrow uniformly sized and spaced U shaped loops of conductive material disposed to define a first coordinate axis of th... | 09/15/1987 |
| 4644102 | Digitizing tablet system A digitizing tablet is disclosed in which two multiplexors are connected to alternate conductive loop elements in each plane of elements. The two multiplexors are connected to a differential amplifier. The signals from the differential amplifier are demod... | 02/17/1987 |
| 4638119 | Position indicating apparatus for use in a digitizing tablet system A position indicating implement is disclosed having a first coil connected to a current source and a second coil inductively coupled with the first coil. A capacitor is connected in series with the second coil so that the current in the first coil induces... | 01/20/1987 |
| 4608658 | Method and apparatus for removing noise at the ends of a stroke caused by retracing A method and apparatus are described for processing a series of digital signals representing a stroke of a stylus on a tablet to remove signals at the ends of the stroke caused by retracing, the series of signals corresponding to the X and Y coordinates o... | 08/26/1986 |
| 4582955 | Digitizing tablet system including a tablet having a grid structure made of two orthogonal sets of parallel uniformly sized and spaced U shaped loops of conductive material A digitizing tablet interactive with a stylus which is inductively coupled to a grid is disclosed. The grid includes a first plurality of narrow uniformly sized and spaced U shaped loops of conductive material disposed to define a first coordinate axis of... | 04/15/1986 |
| 4577057 | Digitizing tablet system having stylus tilt correction A digitizing tablet system of the type including a tablet, a stylus and associated electronics which is constructed to correct for tilt errors when the stylus axis is tilted relative to the tablet is disclosed. The tablet includes a housing having a recta... | 03/18/1986 |
| 4562304 | Apparatus and method for emulating computer keyboard input with a handprint terminal An apparatus and method are disclosed for emulating computer keyboard input from a handprint terminal, the output of the handprint terminal comprising character data along with row and column position data for each character. A line buffer memory temporar... | 12/31/1985 |
| 4534060 | Method and apparatus for removing noise at the ends of a stroke A method and apparatus are described for processing a series of digital signals representing a stroke of a stylus on a tablet to minimize noise at the ends of the stroke, the series of signals corresponding to the X and Y coordinates of a series of points... | 08/06/1985 |
| 4375081 | Multistage digital filtering utilizing several criteria Apparatus for filtering a sequence of digital values representing a stroke of a stylus on a tablet averages sets of digital values, resamples the averaged digital values to accept only those having greater than a minimum amplitude separation and then aver... | 02/22/1983 |
