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| Patent # | Description |
|---|---|
| US-4,494,094 |
High frequency waveguide For a rectangular waveguide the wall thickness of the narrow sides b of the rectangle is smaller than the wall thickness of the broad sides a of the rectangle... |
| US-4,494,093 |
Lockable tuning mechanism with reduced backlash Apparatus for frequency tuning a waveguide cavity comprises a retainer ring and a knob that are threaded onto a plunger in a spaced apart relationship, with the... |
| US-4,494,092 |
Filter pin electrical connector This invention provides a filter pin connector having two capacitor disc assemblies, each with a plurality of openings receiving the connector pins and held... |
| US-4,494,091 |
Damping package for surface acoustic wave devices A surface acoustic wave (SAW) device is fabricated to minimize or eliminate purious signals caused by bulk modes. A backing layer is provided on the bottom... |
| US-4,494,090 |
Frequency modulation system for a frequency synthesizer A voltage controlled oscillator includes a main varactor diode coupled to a frequency resonating circuit to produce an output frequency in response to a control... |
| US-4,494,089 |
Pulse phase modulator/demodulator system A two-wire type converter in which voltage signals detected by a detecting element of a pH meter, for example, are converted into current signals and the... |
| US-4,494,088 |
Oscillator with capacitor charged and discharged by current proportional
to a reference current A silicon integrated oscillator circuit is connected with a capacitor and produces a highly precise and stable triangular output voltage. Both the charge current... |
| US-4,494,087 |
Combiner probe providing power flatness and wide locking bandwidth A distributed inductive reactance is coupled to a terminating impedance at the interface of a combiner probe with a resonant cavity. The distributed reactance is... |
| US-4,494,086 |
Transmission line oscillator having independently adjustable Q and input
resistance A transmission line microwave oscillator having two degrees of freedom wherein the real portion, R.sub.in, of the input impedence seen by the active device is... |
| US-4,494,085 |
Miniaturized atomic frequency standard having both filter cell and
absorption cell in resonator cavity An optical-physics package used in an atomic frequency standard is miniaturized and the performance thereof improved. The optical-physics package includes a... |
| US-4,494,084 |
Pin diode linear attenuator controlled by a companding DAC A companding digital to analog converter (DAC) of a digital input and exponential output is utilized to drive a PIN diode having a logarithmic attenuation... |
| US-4,494,083 |
Impedance matching stripline transition for microwave signals An impedance matching stripline transition for microwave signals which are conducted from a stripline circuit on one laminate (2) to another laminate (4) through... |
| US-4,494,082 |
Switched-capacitor variable equalizer An equalizer for non-loaded telephone lines comprises an active switched-capacitor biquadratic filter including two differential amplifiers. An unswitched... |
| US-4,494,081 |
Variable frequency U. H. F. local oscillator for a television receiver A tunable oscillator develops a signal having a frequency variable over a range of frequencies in response to a control signal. A frequency determining resonant... |
| US-4,494,080 |
Voltage-controlled oscillator with independent gain and frequency
controls A voltage-controlled oscillator (VCO) comprises a current controlled oscillator (ICO) and control circuitry which independently adjusts the gain (K.sub.v) and... |
| US-4,494,079 |
Microprocessor controlled phase locked loops A digital counter is phased locked to a reference frequency by a voltage trolled oscillator which causes the counter to increase its count rate or decrease its... |
| US-4,494,078 |
Class BC power amplifier A class BC power amplifier having a symmetrical push-pull preamplifier and a pair of symmetrical branches coupled, respectively, to the outputs of said push-pull... |
| US-4,494,077 |
Amplifier system switchable between two amplifying operations An amplifier switchable between a dual-channel amplifier and a BTL amplifier includes first and second amplifying circuits having a non-inverting input, an... |
| US-4,494,076 |
Signal input circuit with controlled input signal attenuation A signal input circuit comprising a control member for the controllable attenuation of the input signal and firmly set reactances for the selection of the input... |
| US-4,494,075 |
Volume control circuit A volume control circuit includes an input circuit, which may be a differential amplifier, for converting an input signal to 1st and 2nd currents. The 1st... |
| US-4,494,074 |
Feedback control Headphones have a small cavity between the diaphragm and the ear canal with a microphone in the cavity closely adjacent to the diaphragm providing a feedback... |
| US-4,494,073 |
Frequency generator using composite digitally controlled oscillators A frequency generator for generating a large number of closely and evenly spaced frequencies over a large bandwidth including a first digitally controlled... |
| US-4,494,072 |
Well logging apparatus with replaceable sensor carrying insulating
sleeve disposed in rotation restrained... A replaceable insulating sleeve is disposed around the lower end of a drill string used in drilling a well. The sleeve is restrained from rotating relative to... |
| US-4,494,071 |
Determination of water saturation in earth formations independent of
lithology A method for determining the water saturation of subsurface earth formations substantially independent of lithology utilizing electromagnetic energy propagation... |
| US-4,494,070 |
Apparatus for positioning receptacles of ferromagnetic material and
having a welding seam When receptacles (1) having a substantially cylindrical side wall and a welding seam extending in the direction of the axis are to be angulary positioned it is... |
| US-4,494,069 |
Optical scanning method of testing material defects A method of testing material defects utilizing photovoltaic effect. A detachable, transparent probe coated with either transparent metal or semiconductor is... |
| US-4,494,068 |
Measurement shunt with compensation for induced error voltages A measurement shunt comprises a resistance provided with first and second voltage terminals and intended to provide a voltage representative of an electric... |
| US-4,494,067 |
Fast frequency measuring system Disclosed is a high resolution frequency measuring system which uses a frequency counter for a coarse reading and a frequency to voltage converter for a vernier... |
| US-4,494,066 |
Method of electrically testing a packaging structure having n
interconnected integrated circuit chips Design rules and test structure are used to implement machine designs to thereby obviate during testing the need for mechanical probing of the chip, multichip... |
| US-4,494,065 |
Electric capacity measurement of erratically shorted capacitors A method and apparatus for determining the average clearance between closely fitting cylindrical parts by determining electrical capacity between the bore and... |
| US-4,494,064 |
Direct current inrush limiting circuit Direct current inrush upon connection of a capacitive load to a d.c. voltage is limited through an intermediary circuit. Within such circuit the inrush current... |
| US-4,494,063 |
Satellite dual bus power system In a satellite power distribution system such as for use in a communications satellite, a first load powering power distribution bus receives power from a first... |
| US-4,494,062 |
Circuit assembly for charging an accumulation battery with pulsating
direct current The charging device contains a two-part conductor bar (18', 18"), the two parts of which can be connected by means of a contact pair (32). When the contact pair... |
| US-4,494,061 |
Control Apparatus Control apparatus, for example a thrust demand unit or "throttle box" for an aircraft, comprises a manually movable control grip coupled to drive motor means... |
| US-4,494,060 |
Axis controller for robotic actuator A control for a robotic actuator employs a position processor to determine the phase of a pair of electrooptically generated position signals as well as to keep... |
| US-4,494,059 |
Structure for and method of surface conditioning sensing and indicating
and motor speed control The condition of a surface is sensed by cyclically moving two members having engaged surfaces relative to each other, driving the surfaces for only a portion of... |
| US-4,494,058 |
Motor control for data disc rotating systems A system for rotating a data storage disc in a disc drive and for rapidly bringing the disc to a halt comprises a brushless motor fed with direct current in its... |
| US-4,494,057 |
Speed control system for small medical motors A speed control system for small medical motors. The system comprises a drive voltage regulation circuit, a current detection circuit which generates a detection... |
| US-4,494,056 |
Motor driving circuit A motor driving circuit in which the opposite ends of the motor driving coils of a video tape recorder (VTR) capstan motor are shorted by a group of switching... |
| US-4,494,055 |
Control circuit for an electronically commutated motor including
reversing; method of operating an ECM... In a motor control circuit for an electronically commutated reversible motor used in a ceiling fan, a control is used to reduce the voltage supplied to the motor... |
| US-4,494,054 |
Electric power delivery system and method A power control that delivers electrical power to a A.C. motor at a frequency which is controlled by the motor speed itself without the need for any separate... |
| US-4,494,053 |
Winding voltage balancing circuit for brushless DC motor In a brushless DC motor having a magnet and multiphase coils, a current is distributed from a DC voltage source to the multiphase coils according to a set of... |
| US-4,494,052 |
DC Motor servo system A system for controlling the speed of a brushless DC motor includes a microprocessor for generating stator control drive signals responsive to Hall sensors... |
| US-4,494,051 |
Multi-quadrant brushless DC motor drive A control circuit for a brushless DC motor providing positive control in all four quadrants of motor operation. The circuit provides control of motor current,... |
| US-4,494,050 |
System for supression of underdamped oscillations in ac power drawn by
synchronous motors driving Ward-Leonard... A method and apparatus for reducing oscillations in input electrical power to a Ward-Leonard drive system which is subject to variations in mechanical loading,... |
| US-4,494,049 |
Commutating device for an electric motor supplied from a d-c voltage
source In a commutating device for an electric motor which is supplied from a d-c voltage source, which includes semiconductor switching elements arranged in a bridge... |
| US-4,494,048 |
Scanning control circuit for a television receiver, with gradual startup This invention concerns television scanning circuits. It involves a scanning startup circuit comprising a capacitor, and means of gradual charging or discharging, to... |
| US-4,494,047 |
Convergence device for color-producing cathode ray tube An electron beam convergence device is provided for a cathode ray tube of the type including an electron beam gun for developing three electron beams disposed on... |
| US-4,494,046 |
Single cathode beam mode fluorescent lamp for DC use The lamp shown herein is a beam mode fluorescent lamp for general lighting applications. The lamp comprises a light transmitting envelope, having a phosphor... |
| US-4,494,045 |
Ballast circuit for a 220-volt improved lighting unit A ballast circuit for developing a predetermined desired D.C. voltage to enhance the operation of a gas discharge tube in a lighting unit of the type which also... |
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