Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 4254506 | Channel identification apparatus useful in a multiband sweep type tuning system In a tuning system for generating a tuning voltage for tuning a television receiver, channel identification apparatus includes a memory for storing binary signals representing boundary voltages having magnitudes corresponding to magnitudes of the tuning v... | 03/03/1981 |
| 4233686 | Radio tuner for coupling with tape recorder A radio tuner is detachably coupled with a cassette tape recorder having a rectangular form. It includes an L-shaped tuner casing which is adapted to mate with two adjacent, mutually perpendicular sides of the tape recorder. A rod antenna is received with... | 11/11/1980 |
| 4228546 | AM Radio receiver In an AM receiver, an intermediate frequency amplifier stage is excluded, but a harmonic oscillation circuit is provided for producing a signal synchronous with an amplitude-modulated signal applied thereto, so that the output of the harmonic oscillation ... | 10/14/1980 |
| 4228545 | Receiver device having a function for suppressing transient noises during abrupt interruptions A receiver device comprises a demodulator for demodulating speech signals received at an input terminal of the device, a delay memory for storing, with a delay, speech signals of prescribed period for a predetermined time, a detector for detecting an abru... | 10/14/1980 |
| 4225974 | Double super-heterodyne receiver A double superheterodyne receiver comprising a first mixer responsive to a frequency modulated signal and a first local oscillator signal for providing a first intermediate frequency signal having a frequency f1 and a positive side frequency de... | 09/30/1980 |
| 4225976 | Pre-calibration of gain control circuit in spread-spectrum demodulator In a spread-spectrum receiver, a predetermined noise floor voltage, supplied together with the output of the correlation detector as a control voltage for an AGC amplifier, is subjected to a pre-signal reception adjustment or calibration, in order to comp... | 09/30/1980 |
| 4225971 | Tuning apparatus for providing tuning indication Tuning apparatus which is tunable to different broadcast frequencies and including a scale provided with indicia corresponding to such broadcast frequencies and a pointer movable across the scale to indicate the particular broadcast frequency to which the... | 09/30/1980 |
| 4219779 | Self-oscillating mixer circuit A self-oscillating mixer circuit to operate mainly at SHF band comprises a single-gate FET and a micro strip line. The gate or source terminal of the FET is connected to a radio frequency signal input line. A feedback path is provided between the drain te... | 08/26/1980 |
| 4219837 | Alarms between stations with relative motion An alarm or signalling system between a transmitter station and a receiver station either or both of which may be in motion. A signal is selectively radiated from the transmitter station for detection at the receiver station. The receiver station includes... | 08/26/1980 |
| 4216430 | Noise eliminating circuit with automatic gain control A noise eliminating circuit for detecting and eliminating a noise pulse component included in an amplitude modulated wave, characterized by a circuit arrangement wherein an output of a detector circuit which is adapted to receive an input signal from an I... | 08/05/1980 |
| 4214207 | Switching circuit for radiosonde A radiosonde comprising a transmitter, a modulating oscillator, a control circuit for the oscillator and sensing elements to be switched into and out of said control circuit, characterized in that a solid state switching circuit is utilized for switching ... | 07/22/1980 |
| 4213096 | Phaselock receiver with phaselock detector A phaselock loop in a phaselock receiver includes a voltage-controlled oscillator, and a main phase detector receptive to an output of the oscillator and a received signal. Means to detect when the oscillator is phase locked with the received signal inclu... | 07/15/1980 |
| 4205270 | Station selection indicating device During preset station selection operation in a digital receiver the station selection switch most recently operated is indicated by a light so as to prevent erroneous operation at the same switch again.... | 05/27/1980 |
| 4205268 | Neutrino communication arrangement A communication system comprising an emitter and a receiver (detector) utilizing modulated beams of neutrino and antineutrino waves as information carriers between the emitter and the receiver. Generation of modulated neutrino and antineutrino beams in th... | 05/27/1980 |
| 4205271 | Control device of electronic preset type tuner for multi-band radio receiver An electronic preset type tuning control device of a tuner using a varactor diode means for multi-band radio receiver is disclosed, which comprises a manually operable tuning pulse generator capable of generating a clock signal and an up or down pulse sig... | 05/27/1980 |
| 4204165 | Multichannel coherent receiver A multichannel coherent receiver employing multiple delay lines in series or a tapped delay line into which a received signal band is introduced. The signal band at each tap or increment of delay is mixed with individual related frequencies and the produc... | 05/20/1980 |
| 4204169 | Muting circuit in an electronic tuning type receiver Muting is provided for a receiver during preset channel selection by using the output signals from each channel selection switch to energize a muting circuit. During manual channel selection or during the resetting operation no muting is provided.... | 05/20/1980 |
| 4203072 | Reduction of impulse noise contribution to receiver squelch threshold A receiver includes demodulator, squelch gating and squelch circuit for controlling the gating. A blanking circuit, responsive to impulse type noise, prevents impulse noise energy from contributing to the control of the gating.... | 05/13/1980 |
| 4200840 | Dual detection scheme for compressive receivers Undesired spurious noise signals appearing in the dispersive delay line (DDL) of a compressive receiver are suppressed and the dynamic range of the receiver is significantly increased by utilizing parallel channels of processing in combination with a sign... | 04/29/1980 |
| 4199716 | Microwave hazard alarm A microwave hazard alarm that indicates the presence of microwave radiation from microwave ovens or other transmitting sources by means of a light indicator. The alarm comprises a handheld microwave receiver including an antenna, a detector, a battery pow... | 04/22/1980 |
| 4196395 | Preset state indicating unit in an electronic tuning type receiver A preset state indicating unit for use in an electronic tuning type receiver generates a visual indication when both a presetting switch and one of a plurality of channel selecting switches have been properly selected. The preset state indicating unit thu... | 04/01/1980 |
| 4195263 | Selective call radio communication receiver A paging or like radio communication receiver is disclosed having a crystal oscillator circuit which is connected directly with a power source and is thus held continuously in oscillation at its preset level of frequency irrespective of whether the power ... | 03/25/1980 |
| 4194154 | Narrow bandwidth network compensation method and apparatus A method and means for compensating for the limited bandwidth of antennas and antenna coupling networks and other high powered modulated wave equipment characterized by generating a modulated wave at a relatively low power level, passing the modulated wav... | 03/18/1980 |
| 4194157 | Portable radio receiver with detachable speaker unit An audio apparatus in the form of a radio receiver is composed of a first part including electrical components constituting a tuner housed within a first cabinet for providing audio signals, a second part including at least a loud speaker housed within a ... | 03/18/1980 |
| 4193036 | Balanced active mixer circuit A singly-balanced active mixer circuit is disclosed for developing an IF signal by combining an RF signal and a local oscillator (LO) signal. The RF and LO signals are applied to a strip transmission line ring which provides balanced components of the LO ... | 03/11/1980 |
| 4191966 | CATV block converter A converter that is capable of handling all 35 CATV channels without a separate tuning means. The standard VHF channels 2 through 13 on the cable are passed through to the TV set's VHF tuner and the remaining channels are block upconverted to the UHF freq... | 03/04/1980 |
| 4191924 | Channel selection apparatus A channel selection apparatus comprises a counter, a decoder, a clock pulse generator, and a control circuit for controlling them, and selects a channel by switching a channel selection voltage by selecting a potentiometer. The counter includes a cascade-... | 03/04/1980 |
| 4190803 | Multifrequency superheterodyne receiver with priority channel monitoring A superheterodyne receiver includes a first mixer operative to provide reception on a nonpriority channel upon receipt of output signal from a first oscillator, a second mixer operative to provide reception on a priority channel upon receipt of output sig... | 02/26/1980 |
| 4188585 | Synchronized receiver power system A portable radio receiver powered by a battery includes an RF amplifier, an IF amplifier and an audio amplifier powered by a first regulated, switched, DC power converter that derives a first DC voltage. A frequency synthesizer, including varactor diodes,... | 02/12/1980 |
| 4187467 | Grounded RF power amplifier circuit apparatus Apparatus for and the method of simplifying and economizing upon transmitter power amplifier output stage circuitry is illustrated. By grounding the anode of the RF power amplifier, the FCC required plate voltage meter and plate current meters can be conn... | 02/05/1980 |
| 4186346 | Amplitude modulated transmitter The transmitter has a carrier control and includes an exciter for supplying the carrier voltage to a modulation stage, usually the final RF-power amplifier of a broadcast transmitter, with the modulation voltage having a controlled dc content. The modulat... | 01/29/1980 |
| 4185242 | Signal-to-noise ratio measurement of intermittent signals The signal-to-noise ratio of intermittent reception by a radio receiver from a push-to-talk transmitter is measured by comparing AGC voltage levels derived from a signal period with levels derived from the prior no-signal period containing noise only. The... | 01/22/1980 |
| 4184120 | Mixing circuit A mixing circuit in which the input of a mixing stage connected to a first oscillator stage is coupled to a second oscillator stage through a resistor so as to apply a bias voltage and oscillation output to the input of the mixing stage.... | 01/15/1980 |
| 4183022 | Transponder for radiocommunication system, particularly for measuring the distance between two stations A system for measuring the distance between an interrogating station and a transponder station comprises, at the latter station, a receiver for a phase-modulated UHF wave emitted by the interrogating station and a transmitter for sending back an outgoing ... | 01/08/1980 |
| 4181892 | Sweeping noise blanker A noise rejection circuit for a communications receiver in which the input o the receiver is continually sampled by a sweeping heterodyne oscillator to develop a difference frequency noise signal which represents the input noise over a wide frequency band.... | 01/01/1980 |
| 4178552 | Noise eliminating circuit A noise eliminating circuit for an AM receiver wherein noise pulse component included in an amplitude modulated wave are eliminated by making the RF or IF stage of the receiver an open circuit during such noise, while at the same time, compensating for th... | 12/11/1979 |
| 4177430 | Adaptive noise cancelling receiver A receiving system is described which has the capability of substantially cancelling broadband noise, such as impulse noise, atmospheric noise, electrical line noise and receiver front end noise, from a selected radio frequency passband. In a first embodi... | 12/04/1979 |
| 4176318 | Radio transmitter display indicator Apparatus for visually indicating a particular operational condition of a radio transmitter, such as the transmitter being activated or the percentage amplitude modulation of the transmitted carrier. An electrical or electronic character display module ha... | 11/27/1979 |
| 4172996 | Squelch circuit A squelch circuit for use in an angle-modulation communication receiver includes a squelch switch responsive to a control signal generated by a squelch control circuit. The squelch control circuit has a level detector for detecting a carrier level of a re... | 10/30/1979 |
| 4171514 | Radar system with stable power output A radar system having automatic compensation to the heater power applied to the final output tube for changes in the peak tube power output. Substantially constant peak power is attained for radar pulses of varying widths and over a plurality of range sca... | 10/16/1979 |
