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| Number | Title | Issue Date |
| 4083100 | Method of manufacturing a keyboard assembly An improved method is disclosed for manufacturing a keyswitch assembly which includes a plurality of switches in a predefined arrangement on the face of an insulative circuit board and which also has a protective, insulative coating over the switches and ... | 04/11/1978 |
| 4056699 | Touch plate assembly A touch plate assembly for a digital control device. The touch plate is sectioned off into a plurality of touch switch areas, each of which represents certain information to be entered into the control circuit. The touch plate and a printed circuit board,... | 11/01/1977 |
| 4055755 | Switching assembly in combination wristwatch and calculator In a combination wristwatch and calculator, a key input means for information entry employs a touch sensitive electronic switching circuitry comprising a C-MOS inverter. One electrode for the touch sensitive electronic switching circuitry is provided on t... | 10/25/1977 |
| 4047241 | Capacitive switch A capacitive switch includes: an electrical circuit formed by two spaced pads of conductive material on an insulative substrate; and a capacitive coupling member on the end of a keystem wherein the end of the keystem has a looped ribbon formed by two laye... | 09/06/1977 |
| 4037225 | Keyboard encoding system with electronic hysteresis A keyboard encoding system which utilizes electronic hysteresis to prevent undesired key stroke encoding. The output of a capacitive switch matrix is supplied to a sense amplifier which has its sensitivity increased if a particular switch of the switch ma... | 07/19/1977 |
| 4034234 | Switching module for solid-state keyboard A switching module for a solid-state keyboard or the like comprising an actuating key manually movable between a first and a second position and a variable capacitor. The capacitor has a rigid stationary electrode and another electrode movable toward and ... | 07/05/1977 |
| 4027569 | Keyboard for an electronic musical instrument employing variable capacitors A keyboard of an electronic musical instrument incorporates a plurality of variable capacitors, one for each key, with one conductor of each capacitor being connected for movement with an individual key of the keyboard toward and away from the other condu... | 06/07/1977 |
| 4023343 | Electronic clock with capacitative resetting A reset system for a digital electronic clock of the multistage counter type. Means are provided for deriving from the mains alternating current timing pulses at a frequency substantially higher than 1 Hz and a frequency divider chain derives from these t... | 05/17/1977 |
| 4016490 | Capacitative proximity sensing system A leakage field capacitor has two adjacently located surface electrodes placed on an essentially plane support surface. A signal source is connected to one of the electrodes, so that this electrode, which may then be termed the transmitting electrode, wil... | 04/05/1977 |
| 4001536 | Microwave oven controls A control for a microwave oven is disclosed in which cooking time is set by touching one of a number of touch plates on the oven control panel. An oscillator provides an asymmetric signal to a plurality of level detectors by way of the touch plates and as... | 01/04/1977 |
| 3974472 | Domestic appliance control and display panel A domestic range including a touch control and display panel and digital control logic for energizing power circuits controlling the various range heater elements in response to a program entered by the user by touching certain areas of the panel. The con... | 08/10/1976 |
| 3973255 | Touch responsive keyboard apparatus A keyboard apparatus for utilizing equipments, such as electronic musical instruments, computers, and other control and data handling devices, which responds to imposition of a flexible conductive element, such as the operator's finger, on a selected one ... | 08/03/1976 |
| 3971013 | Touch keyboard A touch operated keyboard comprising an AC driven gas discharge panel display with conductive touch keys located to pick up an AC voltage from the stray field generated by the gas discharge panel is disclosed. A detector detects the drop in AC voltage lev... | 07/20/1976 |
| 3968488 | Electronic keyboard An electronic keyboard comprises a plurality of depressable keys each one of which comprises a stem normally movable and connected through a spring to a metallic actuator. Each actuator is lodged in a supporting element jutting out from the stem and coope... | 07/06/1976 |
| 3958239 | Capacitive transistorized signaling device An electronic device incorporating a circuit for providing a signal with respect to an on or off mode dependent upon the degree of capacitance. The invention comprises a first and basic embodiment utilizing a signal source having a slope of a step functio... | 05/18/1976 |
| 3947696 | Touch actuated electronic switch A touch actuated electronic switch is disclosed including a surface, accessible to the touch of a human, interconnected with a differential amplifier. In the preferred embodiment, if increased noise immunity or noise protection is desired, a twisted pair ... | 03/30/1976 |
| 3947390 | Arch shaped snap-type switch contact A switching plate having a plurality of arch-shaped snap-type switching members formed in a continuous metallic sheet or from sections of a metallic sheet bonded to an insulating substrate. Adjacent of the switching members extend in transverse directions... | 03/30/1976 |
| 3943812 | Touch responsive sensor in electronic keyboard musical instrument A touch responsive sensor for an electronic keyboard musical instrument of a variable capacitor type, which comprises a pair of electrodes spaced apart from each other, and an intermediate electrode interposed between the pair of electrodes and separated ... | 03/16/1976 |
| 3931610 | Capacitive keyswitch sensor and method Each of the inputs of an analog multiplexer are connected to a plurality of capacitive keyswitches and a reference capacitor. At the first multiplexer scan position, the reference capacitor is charged through a charging resistor and when a predetermined v... | 01/06/1976 |
