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| Number | Title | Issue Date |
| 4004140 | Digital attenuator A digital attenuator is disclosed which is capable of having the output PCM signal attenuated nearly in proportion to the input PCM signal level based upon simple logic operations of where Pout = output PCM signal Pin = input PCM signal p... | 01/18/1977 |
| 3944799 | Ratio computer A computer, for use with a machine tool, can make any of a number of calculations involving ratios between two operands to determine the angular velocity of the spindle of the machine, the velocity and position of a movable member such as a carriage, and ... | 03/16/1976 |
