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| Number | Title | Issue Date |
| 4874549 | Pressure sensitive electro-conductive materials The invention relates to a pressure sensitive electro-conductive material which can be utilized as a pressure sensitive electro-conductive switch or as a variable resistor. The switch comprises two electrodes with a deformable pressure sensitive electro-c... | 10/17/1989 |
| 4749878 | Input device for control system A variable force push button is used as an input device for a control system. Specifically, a bi-directional storage device produces a command that is applied to an element to be controlled. A signal is generated having a characteristic representative of ... | 06/07/1988 |
| 4745301 | Pressure sensitive electro-conductive materials A pressure sensitive electro-conductive material which can be utilized as a pressure sensitive electro-conductive switch or as a variable resistor. The switch comprises two electrodes with a deformable pressure sensitive electro-conductive material sandwi... | 05/17/1988 |
