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| Number | Title | Issue Date |
| 4071689 | Lucent electrographic sensor for determining planar coordinates An electrographic sensor for determining planar coordinates is described whereby graphical material to be analyzed may be placed beneath, or projected against, the rear surface of the sensor. This sensor is of particular value for placing on the face of a... | 01/31/1978 |
| 4022969 | Apparatus for signalling the position of a point on a surface Apparatus for signalling the position of a point on a surface divided into a plurality of identical subsidiary areas includes primary transducer means operable to identify uniquely the subsidiary area in which the point is located, and secondary transduce... | 05/10/1977 |
| 4020281 | Iterative coordinate data approximation system for photoemissive pixel pattern displays Almost any Photoemissive Pixel Pattern Display Tube (PPDT) System, such as one for a Photoemmisive Matrix Display Tube (PMDT) display system is capable of supplying an indication of coordinate data for input to data processing systems and the like with th... | 04/26/1977 |
| 3967267 | Light pen detection for plasma panels using specially timed scanning address pulses An enhanced light pen capability is provided in plasma display panels by applying specially timed write and erase pulses in a scanning manner over the panel, the pulses being shaped and positioned relative to the normal sustain pulse sequence in such mann... | 06/29/1976 |
| 3944729 | Stabilized terrain optical position sensor A system for providing a display of information to a helicopter pilot perting the pilot to hover over a fixed land position selected while in flight includes a television monitor upon whose screen the pilot sees the forward scene on the top portion of th... | 03/16/1976 |
| 3932862 | Coloringbook, a solid state display device A two-dimensional matrix of semiconductors is arranged in ordered array as a flat, light emitting and light sensing device for input and read-out of information from a computer. A penlight is used to activate the light sensing semiconductors to achieve a ... | 01/13/1976 |
