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| Number | Title | Issue Date |
| 4309768 | Mismatch detection circuit for duplicated logic units A detection circuit for detecting a mismatch between the output signals of duplicated logic units (10a, 10b). The output terminals of one of the duplicated logic units are correspondingly connected to the output terminals of the other duplicated logic uni... | 01/05/1982 |
| 4266145 | Time dependent master reset A circuit for use with logic circuitry preventing any transients due to the power down and power up conditions of a power supply from causing any false or random operations of the logic. The turn off transients are suppressed by a reset signal to the logi... | 05/05/1981 |
| 4215340 | Process for the automatic signalling of faults of a static automatic module and a module for realizing the process Process for the automatic signalling of faults of an automatic static safety module and a module realizing said process which can be used in automatic safety systems which can, for example, be used in nuclear reactors. The module comprises at least one pa... | 07/29/1980 |
| 4199727 | Malfunction detector Malfunction Detector apparatus has a plurality of sensing means, each sensing means is designed to provide a signal when an operation is performed and a different signal when the operation is not performed. Circuitry is designed to initiate timing and if ... | 04/22/1980 |
| 4179629 | Failsafe logic function apparatus An improved failsafe logic function apparatus is disclosed which includes an input signal section and an output signal section, with a middle gating network section isolated from each of the input signal section and the output signal section. An external ... | 12/18/1979 |
| 4130764 | Fail-safe or logic circuit A fail-safe "OR" logic gate circuit which includes at least a first and a second level detector each of which has a voltage breakdown device and an oscillating circuit, a resonant tank circuit connected in common with each of the oscillating circuits, an ... | 12/19/1978 |
| 4125784 | Fail-safe or gate A fail-safe "OR" logic gate circuit which includes at least a first and a second level detector each of which has a voltage breakdown device and an oscillating circuit, a separate resonant tank circuit each of which is tuned to substantially the same freq... | 11/14/1978 |
| 4097764 | Fail-safe solid state logic A fail-safe solid state logic system based on the use of an AC input signal of one type, and a DC input which causes a logical gate to convert the AC input signal to a totally different AC output signal; that is, to one adapted to be received by a vital d... | 06/27/1978 |
| 4069428 | Transistor-transistor-logic circuit Disclosed is a transistor-transistor-logic (TTL) circuit which is testable by D. C. Testing Techniques. The improvement includes a high impedance network for providing sufficient base drive to drive the output transistor into conduction when the malfuncti... | 01/17/1978 |
| 4034356 | Reconfigurable logic array This specification describes a set of arrays for performing logic function in various subsets of the original set. The array structure is characterized by a plurality of arrays joined together with a bidirectional bussing system. This bussing system compr... | 07/05/1977 |
| 3995173 | Solid state fail-safe logic system A solid state fail-safe logic system is disclosed including AND and OR gates which are designed as an evolutionary replacement for signal control functions previously performed by vital front and back contacts of vital relays and power check logic. The AN... | 11/30/1976 |
| 3992636 | Digital input circuit with fault detection means The state of a sensing device such as a switch is indicated as a logic signal at a circuit output terminal and a malfunction is indicated at another circuit output when the connections to the sensing device open circuit or short circuit. The input circuit... | 11/16/1976 |
| 3950656 | State detecting apparatus State detecting apparatus comprising: first, second and third terminals, first and second potential detecting circuits each having an input and an output, a resistance, means connecting the inputs of the first and second potential detecting circuits to th... | 04/13/1976 |
