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| Number | Title | Issue Date |
| 4072878 | Starting and operating apparatus for high pressure sodium lamp ballasts A lighting apparatus which provides for high voltage pulses for starting a high pressure sodium lamp. This apparatus uses a zener diode circuit which provides appropriately timed starting pulses even at relatively low line voltage. The apparatus can be de... | 02/07/1978 |
| 4057763 | Current amplifiers Current mirror amplifiers, which exhibit greater current attenuation (or gain) than prior art current mirror amplifiers taking up the same area on a monolithic integrated circuit die, are described in which the base-emitter junctions of the mirroring tran... | 11/08/1977 |
| 4053847 | Self-feedback type low-noise charge sensitive amplifier A so-called charge sensitive amplifier is used as a pre-amplifier for a semiconductor detector. A field-effect transistor (FET) is used as the input stage of the amplifier, wherein the gate terminal of the FET is fed back from the output of the amplifier ... | 10/11/1977 |
| 4050029 | Electronic apparatus comprising an audio amplifier providing shunt voltage regulation Electronic apparatus is disclosed suitable for integrated circuit fabrication and comprising shunt voltage regulation. The electronic apparatus may be a radio receiver which uses an unregulated current source for its supply voltage. The power amplifier of... | 09/20/1977 |
| 4048578 | R.F. amplifier circuit An R.F. amplifier circuit having a high selectivity with a simple and inexpensive construction is provided. An R.F. choke coil acting as a bias supplying element is connected to a collector of an amplifying transistor to supply it with an optimum biasing ... | 09/13/1977 |
| 4048579 | Feed-forward amplifier A feed-forward amplifier with an input arranged to receive wide-band signals and an output to supply a linearly amplified version of these has two parallel signal paths arranged between such input and output, one of the signal paths includes a cascade con... | 09/13/1977 |
| 4047119 | Transistor differential amplifier circuit A transistor differential amplifier circuit includes a pair of NPN type amplifying transistors operated by a constant current source commonly connected to their emitters, and a pair of PNP type load transistors inserted in the collector circuits of said a... | 09/06/1977 |
| 4047118 | Transistor amplifier circuit In a transistor amplifier circuit comprising a common-emitter amplifier transistor, a collector load resistance has one end connected with the collector of the transistor, a constant-current circuit is connected with the collector of the transistor, and a... | 09/06/1977 |
| 4047122 | Frequency compensated differential amplifier In differential input DC gain amplifiers with high input impedance, a capacitive attenuator is built-in in order to reduce the amplifying effect on the AC component due to interference by the industrial power lines. Such attenuation is obtained by feeding... | 09/06/1977 |
| 4047069 | High-pressure mercury-vapor lamp having a plural phosphor coating A high pressure mercury vapor lamp having an outer bulb with a plural-phosphor coating on the inside surface thereof. A first phosphor provides for emission peaks within the range of wavelengths between 440 and 540 nm and contains strontium chloroapatite,... | 09/06/1977 |
| 4045731 | Filter having an automatically controlled variable cut-off frequency A device for measuring the frequency or period of an input signal independent of different frequency noise signals which may be superimposed on the input signal includes a filter circuit having a variable cut-off frequency. The output level of the filter ... | 08/30/1977 |
| 4042885 | Zeroing circuit A zeroing circuit for use in conjunction with devices that produce output signals in response to input data signals feeds a compensating signal into such a device to produce a zero output signal when there is a zero input signal. The device being compensa... | 08/16/1977 |
| 4042890 | High efficiency electrical power conditioner An A.C. powered amplifier for converting low power information input signals to corresponding signals of a substantially increased power level without requiring a power transformer. A signal processor having a low power information signal input and a feed... | 08/16/1977 |
| 4042889 | Overvoltage protection circuit for general purpose amplifier An output stage and feedback circuit for a buffer amplifier are disclosed. The output stage protects an operational-amplifier circuit preceding it from overvoltages appearing at the load. The circuit includes a pair of complementary transistors in a push-... | 08/16/1977 |
| 4041347 | Cathode-ray tube having conductive internal coating exhibiting reduced gas absorption A cathode-ray tube having a conductive internal coating comprised of carbon, optionally iron oxide, lithium silicate and at least one of sodium and potassium silicates on the interior walls of the tube.... | 08/09/1977 |
| 4041410 | RF level detector A circuit for detecting the amplitude of a RF signal propagating along a transmission line. A plurality of rectification circuits, each including a diode and a filter capacitor, are located at different positions along the line. The signal electrodes of t... | 08/09/1977 |
| 4041413 | Automatic phase compensation circuit for paralleling power amplifiers in the microwave frequency range A system for phase control of multiple high power microwave frequency amplifiers. A pilot frequency lower than the frequency to be amplified is used to modulate the microwave signal. The pilot frequency is detected at the output of the amplifier stage and... | 08/09/1977 |
| 4039898 | Electronic flash apparatus An electronic photographic flash apparatus which is useful as an artificial light source for taking photographs. The apparatus of this invention does not use an AC charger or the like as its power source, but it uses a plurality of secondary batteries nor... | 08/02/1977 |
| 4039963 | Stabilizer for the base level of an amplifier The output of an amplification assembly is coupled with the input of an integrating circuit by means of a first controlled switch. The output of the integrating circuit is coupled with the input of an intermediate stage and subtracted from the amplifier i... | 08/02/1977 |
| 4037167 | Automatic gain control amplifier An AM converter and AGC amplifier are described for use either separately or in combination in a radio receiver. The AGC amplifier includes a semiconductor device directly coupled to the amplifier input for receiving automatic gain control signals. The AM... | 07/19/1977 |
| 4037169 | Transistor amplifier A low-noise, small-signal transistor amplifier particularly suited for use as a preamplifier in an acoustic or audio apparatus employs a field effect transistor having triode-type characteristics in a common source type amplification circuit, with the gat... | 07/19/1977 |
| 4037170 | Difference amplifier having extended common mode range A difference amplifier, the construction of which includes operational amplifier, has an extended amplitude range of common mode signal. The input of the circuit which is applied to the inversion input of the operating amplifier is applied to the latter t... | 07/19/1977 |
| 4035681 | Polygonal lens A lens cap, for use with a light emitting diode, comprises: A. an end wall and a side wall defining a skirt integral with said end wall, B. the skirt being polygonal and defining interior corners, C. the skirt interior surface defining serrations extending lengthwi... | 07/12/1977 |
| 4035689 | Panel-type display device A display device comrising a panel structure including a plurality of gas-filled cells and including, within the body of the panel, gas communication channels extending between selected cells to provide a selective flow of excited gaseous particles from c... | 07/12/1977 |
| 4035737 | Low noise amplifier A low noise amplifier for amplifying a signal from a moving coil phono cartridge which comprises a plurality of pairs of complimentary first and second transistors in push-pull and each pair in parallel, with a resistance of relatively low-value in the em... | 07/12/1977 |
| 4035738 | Low noise amplifier A low-noise, stage-stabilized, direct-coupled, single-ended amplifier cirt is disclosed which has a unique feedback network combined therewith in such manner that degenerative alternating current and substantially constant direct current feedback signals... | 07/12/1977 |
| 4034257 | Mercury vapor lamp utilizing a combination of phosphor materials Color correction is provided in a high-pressure mercury vapor discharge lamp with a particular combination of two different phosphor materials producing an efficient composite emission. A blend of said phospor materials can improve color rendition without... | 07/05/1977 |
| 4034308 | Amplifier with controllable transmission factor and switchable control characteristic An amplifier circuit whose gain bears a desired relation to a control voltage, including a differential amplifier, a plurality of impedances interconnected between the amplifier terminals and switches interconnected with the impedances and switchable betw... | 07/05/1977 |
| 4034307 | Current amplifier A current amplifier (CMA) having plurality of input terminals and an output terminal. Each input circuit and the output circuit of the CMA includes the conduction path of a separate one of a plurality of transistors. Means are provided for applying substa... | 07/05/1977 |
| 4032856 | Drift compensated amplifier, particularly for measuring signals A gas analyzer has an output amplifier circuit which is drift compensated in that zero volts are established across a gain network for a particular low point measuring signal as the amplifier provides an output on the basis of a particular bias, while the... | 06/28/1977 |
| 4032854 | Amplification and gain control circuit An amplification and gain control circuit is disclosed in which there is provided in the output circuit of an amplification circuit receiving a gain control input, a semiconductor junction capacitance whose capacity is increased when the amplification cir... | 06/28/1977 |
| 4032811 | Unitized in-line electron gun having improved support structure This disclosure depicts and describes a unitized, in-line electron gun for television cathode ray tubes having a bead-type structure for mechanically supporting, spacing, and aligning gun components. This disclosure is particularly directed to an improved... | 06/28/1977 |
| 4032817 | Wide range power control for electric discharge lamp and press using the same A mercury vapor electric discharge lamp is supplied with AC electric power, which is variable over a wide range, to control the lamp output power in the form of the intensity of the electromagnetic radiation emitted over a correspondingly wide range of fr... | 06/28/1977 |
| 4032853 | Overdrive detector for radio frequency amplifier A relatively simple, inexpensive, effective circuit for detecting overdriving of a radio frequency amplifier by an amplitude modulated signal. The input and output signals of the amplifier are coupled to peak detectors. A light emitting diode which provid... | 06/28/1977 |
| 4031482 | Bias circuit for FET A bias circuit particularly adapted for use with a field effect transistor whereby the drain bias current of the field effect transistor is maintained constant in the event of fluctuations in the operating voltage applied to the field effect transistor by... | 06/21/1977 |
| 4031480 | Circuit arrangement for the ungrounded transmission of signals through testing points in communication systems A circuit arrangement for the ungrounded transmission of signals through testing points in communication systems with the aid of high-frequency oscillations. The high-frequency oscillations are controlled on the one side of the testing point and are recti... | 06/21/1977 |
| 4031481 | Transistor amplifier A transistor amplifier comprised of a class-A amplifier connected in cascade with a push-pull amplifier. The class-A amplifier includes first and second field effect transistors having triode-type dynamic characteristics with their respective gate electro... | 06/21/1977 |
| 4028630 | Push-pull amplifier arrangement A push-pull B-stage in IC is arranged with an additional transistor in such a manner that one transistor in the IC and the additional transistor together constitute a new push-pull amplifier while the transistor in the IC is loaded to a higher extent and ... | 06/07/1977 |
| 4028632 | Power dividing and combining techniques for microwave amplifiers A novel microwave power divider is disclosed that is a combination of an ort junction circulator and a novel isolator-mismatch device for each circulator port other than one input port and divides microwave signal power incident to the input port into an... | 06/07/1977 |
| 4028634 | Feed-forward amplifier with simple resistive coupling Feedback amplifiers having zero or infinite input and output impedances are used as the main amplifier and error amplifier elements of a feed-forward amplifier system. This allows the required impedance matching with simple resistive coupling networks rat... | 06/07/1977 |
