Did You Know...
...that two musicians were responsible for the invention of color print film? Fascinated by photography, Leopold Godowsky and Leopold Mannes worked together to produce an easy-to-use, practical color film. They worked full time as music teachers and gave concerts while experimenting during their off hours in Mannes' kitchen. Their success earned them full-time, well-paying jobs at Kodak and their efforts resulted in Kodachrome film, which was introduced in 1935.
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| Number | Title | Issue Date |
| 4947406 | Communication interface A communication interface for connection to a communication apparatus provided with a balanced-type interface circuit includes a circuit for outputting a constant voltage approximately at the middle of the voltage level of transmitted data signals and is ... | 08/07/1990 |
| 4902916 | Identification of defects in emitter-coupled logic circuits An ECL logic circuit uses a single resistor in place of separate current-source and emitter-follower resistors. A single tap connects a point on this resistor to the ground bus, and the signal-output line connects to this resistor by a contact which is se... | 02/20/1990 |
| 4868420 | Flip-flop circuit An improved flip-flop circuit is provided which prevents the occurrence of soft errors due to rays and the like emitted from a trace amount of radioactive materials contained in a semiconductor package material. The flip-flop circuit has a first l... | 09/19/1989 |
| 4857762 | Digital 2-of-3 selection and output circuit For the operation of a technical system having increased safety requirements, all of the apparatus for increasing the safety and the availbility are provided in triple redundancy. As selection and output circuit, three redundant data channels (DE1, DE2, D... | 08/15/1989 |
| 4835416 | VDD load dump protection circuit The present invention provides power supply load dump protection circuitry for insuring that supply voltages that are applied to the supply pad of a low current logic circuit and which exceed a preselected voltage level are prevented from damaging the log... | 05/30/1989 |
| 4829198 | Fault tolerant logical circuitry A fault tolerant logic circuit capable of absorbing many D.C. and A.C. defects. The logic circuit employs a number of redundant logic gate circuits. The gate circuits are arranged in at least first and second interconnected signal paths. The logic gate ci... | 05/09/1989 |
| 4812677 | Power supply control with false shut down protection An circuit arrangement acts in response to an external wake signal to provide fail-safe, battery saving control to a power supply. The arrangement includes a power supply, a microcomputer which is responsive to the external wake signal for providing a shu... | 03/14/1989 |
| 4795921 | Logic operation-oscillation circuit In an "AND" logic operation-oscillation circuit in which an oscillating output is produced when a signal of a voltage higher than the voltage of a circuit power source is applied a diffused resistor is used for a resistor to which a voltage lower than the... | 01/03/1989 |
| 4775810 | Parity check logic circuit A multiple-input logic circuit for carrying out an even parity check operation or an odd parity check operation on a plurality of input signals has such a circuit construction that a signal only passes through a maximum of essentially two gates between an... | 10/04/1988 |
| 4755692 | Vital safety monitoring circuit A vital safety monitoring circuit including an electromagnetic transformer for feeding periodic check signals into one leg of a balanced bridge network having a pair of input and output terminals. A solid-state switching circuit is connected across the pa... | 07/05/1988 |
| 4721869 | Protection circuit for an insulated gate bipolar transistor utilizing a two-step turn off A driving circuit for an insulated gate bipolar transistor (IGBT) which has a power source, a gate voltage input circuit which supplies the voltage to a gate terminal of IGBT, a detecting circuit for detecting a collector to emitter voltage of the IGBT an... | 01/26/1988 |
| 4709158 | Arrangement for restoring the L.F. content of a digital signal The invention relates to an arrangement for restoring the L.F. content of a digital signal which has been conveyed through a high-pass filter. This is realized with the aid of a center clipper which is connected to the output of the filter. The restored d... | 11/24/1987 |
| 4707621 | Multiplex control apparatus having middle value selection circuit The middle value selection circuit includes three high value selection circuits and one low value selection circuit. Each high value selection circuit consists of a pair of first NPN transistors and a first constant current circuit. The emitter of each fi... | 11/17/1987 |
| 4682057 | Circuit design technique to prevent current hogging when minimizing interconnect stripes by paralleling STL or ISL gate inputs An STL or ISL logic circuit comprising a plurality of single-input, multiple-output logic gates is provided. Each of these gates has a current source and a transistor including a base, emitter and multiple Schottky diode-to-collector contacts. The bases o... | 07/21/1987 |
| 4677316 | Logic circuit with threshold and built-in safety The invention pertains to a logic circuit with threshold and built-in safety such that any change in the characteristics of its components produces a relative increase of the threshold value. It comprises a comparator (7) one input of which receives a ref... | 06/30/1987 |
| 4667184 | Apparatus for counting enumeration input pulses In an apparatus for counting enumeration input pulses according to the present invention, an enumeration input pulse is put in parallel in a plurality of stages of logical product computing oscillator means, and counting in the logical product computing o... | 05/19/1987 |
| 4656417 | Test circuit for differential cascode voltage switch An improved testing and checking circuit for a Differential Cascode Voltage Switch which uses N-devices for both the invalid (0,0) and (1,1) state detection of Q and Q switch signals, and uses decoupling pass devices for sampling the data at the fall of t... | 04/07/1987 |
| 4636660 | Fail-safe "AND" gate using capacitor discharge through a transformer The invention involves an "AND" logic circuit with built-in safety comprising a first and a second input to which pulses can be applied, and respectively tied to the base of a first and a second transistor (1,2) each having a collector to which a referenc... | 01/13/1987 |
| 4626708 | Electronic logic to enhance switch reliability in detecting openings and closures of redundant switches A logic circuit is used to enhance redundant switch reliability. Two or more switches are monitored for logical high or low output. The output for the logic circuit produces a redundant and failsafe representation of the switch outputs. When both switch o... | 12/02/1986 |
| 4621201 | Integrated circuit redundancy and method for achieving high-yield production A circuit structure, and method for forming the structure, permits wafer scale integration by fabricating plural copies of the circuit in integrated circuit form, and interconnecting predetermined circuit element groups of the copies in a manner that perm... | 11/04/1986 |
| 4611295 | Supervisory control system for microprocessor based appliance controls A supervisory control system for microprocessor based appliance controls, the supervisory control system incorporating means for detecting dynamic failure of a microprocessor incorporated in the appliance control, means for disabling the high energy circu... | 09/09/1986 |
| 4608504 | Interface circuit for interconnecting peripherals to an information processing device An interface circuit for an information processing device comprises a plurality of buffer circuits each formed of a plurality of C-MOS tri-state buffers. The buffers are provided for communicating between the devices and an interface line which includes a... | 08/26/1986 |
| 4590388 | CMOS spare decoder circuit A spare decoder provides for the substitution of a spare component for repair of a defective semiconductor chip. For example, a spare row or column of memory cells can be substituted for a defective row or column of a memory chip by fusing fusible links i... | 05/20/1986 |
| 4567384 | Voltage offset producing circuit for use with a line receiver or the like A circuit which may be utilized with a EIA RS 422/423 line receiver to guarantee that the output of the receiver goes to a known output logic stage when there is no signal supplied at the input thereof. The circuit comprises a pair of substantially indent... | 01/28/1986 |
| 4564774 | Binary logic device having input and output alternating signals There is provided a logic device wherein an alternating input signal having a frequency which is one of two frequencies allotted to two input logical values, respectively, positive logic "1" and negative logic "0", is inputted to the device. An output log... | 01/14/1986 |
| 4511812 | Programmable logic array, including an arrangement for invalidating faulty and term outputs A programmable logic array comprises an AND array for producing AND term outputs on a plurality of AND term lines, an OR array which receives the AND term output of the AND array as inputs thereto, and an AND term disregarding array connected to the AND t... | 04/16/1985 |
| 4488303 | Fail-safe circuit for a microcomputer based system A fail-safe protection circuit for a data processor controlled system having a data bus for carrying data and comprising first logic for checking the operation of the data processor controlled system at periodic intervals not greater than T1 an... | 12/11/1984 |
| 4475049 | Redundant serial communication circuit A circuit for carrying data between a host system and a remote unit includes first and second edge-triggered delay-type flip-flops coupled to first and second input lines, respectively. Combinational logic coupled to the output of the first flip-flop and ... | 10/02/1984 |
| 4447851 | Trip system A trip system comprises groups of three switches, each group being responsive to a single trip initiating event and each switch switching a different phase of a three phase power supply. Three trip actuators are each connected between different pairs of s... | 05/08/1984 |
| 4446437 | Pulse monitor circuit A pulse monitor circuit which detects failure of a monitored pulse by monitoring its expected occurrence during time intervals defined by an external reference pulse train. Failure of the reference pulse train is detected by monitoring its expected occurr... | 05/01/1984 |
| 4441136 | Switching circuit A switching circuit has a solid state power switch (9) which is either a PNP or NPN transistor or a VMOS p- or n-channel device. Three individual sensing circuits (2, 3, 4) are set to indicate whether a predetermined operating characteristic of the switch... | 04/03/1984 |
| 4425517 | Fail soft tri-state logic circuit A tri-state logic circuit which, upon failure of its operating potential, produces a high impedance between its output terminals. The tri-state logic circuit includes first and second complementary conductivity type transistors each with a control electro... | 01/10/1984 |
| 4405982 | Arrangement for monitoring the function of a programmable electronic switching circuit An arrangement for monitoring the function of a programmable electronic switching circuit, such as, a microprocessor or microcomputer, characterized by a monitoring switch is associated with and is connected with the reset input and the clear input of the... | 09/20/1983 |
| 4380811 | Programmable logic array with self correction of faults An apparatus and a method to automatically locate defects and to automatically insert and personalize dummy lines in a PLA having latches controlling the cross points of the AND and OR array. Upon occurrence of an error in the PLA, a check signal is gener... | 04/19/1983 |
| 4369379 | CMOS Frequency divider circuit having invalid signal override An improved CMOS frequency divider circuit is disclosed which has override logic for forcing the circuit to exit from a forbidden state to a valid state.... | 01/18/1983 |
| 4344002 | Detection circuit and structure therefor A detection circuit particularly adapted as a smoke detector employs a minimum number of components by a CMOS integrated circuit which receives directly the output of a smoke detector on one of the inputs of an input comparator circuit which provides stat... | 08/10/1982 |
| 4336461 | Fail-safe apparatus A fail-safe logic circuit which includes a pulse generator driven series arrangement of opto-isolators each of which generates a pulsating signal at its output as a function of the logic level state of its respective input terminal. If all input terminals... | 06/22/1982 |
| 4322634 | Device for protection in the case of d.c. supply-voltage drop A device for protection against power failures, having a programmable current source with two levels, which are controlled by a threshold detector, the current from the source being large at high voltages and reduced at low voltages.... | 03/30/1982 |
| 4320315 | Fail-safe and gate circuit A fail-safe AND logic circuit including a free-running multivibrator and a pair of voltage reference networks. The multivibrator includes a pair of common emitter transistor amplifiers. The transistor amplifiers are separately biased and powered by an ind... | 03/16/1982 |
| 4319147 | Monitoring apparatus Monitoring apparatus for producing an output in response to a predetermined condition comprising bistable means (4) having a set input, a reset input and an output; trigger means (2, 6) for applying a first train of pulses ($c;1) to one of t... | 03/09/1982 |
