Patents Examined by T. M. Blum
  • Radio direction finder with array element signal processing
    Patent number: 4034376
    Abstract: A radio navigational device for determining the angle of a mobile craft by analyzing the signals arriving at each element of a linear array of n equally spaced elements. A series of received R.F. pulses emanating from the mobile craft by transmission or reflection provide contemporaneous signals at the antenna elements with a phase difference .psi. between successive elements in accordance with the angle of arrival of the R.F. pulses. Using "zero" IF techniques, each signal of the series is processed to provide signal outputs in I and Q form. Sequential or parallel sampling of these I and Q signals provides a synthesized scanning beam signal from which .psi. is determined.
    Type: Grant
    Filed: July 22, 1976
    Date of Patent: July 5, 1977
    Assignee: International Standard Electric Corporation
    Inventor: Paul Barton
  • Gate drive circuit for thyristor deflection system
    Patent number: 4034263
    Abstract: A thyristor gate drive circuit includes a unidirectional current conducting device coupled to charge a capacitor with single polarity signals. The discharge of the capacitor is controlled so that polarity changes in the drive waveform do not effect the polarity of the drive signal coupled to the gate.
    Type: Grant
    Filed: September 12, 1975
    Date of Patent: July 5, 1977
    Assignee: RCA Corporation
    Inventor: Wolfgang Friedrich Wilhelm Dietz
  • Collimated beam electron gun system for shaped beam cathode ray tube
    Patent number: 4032815
    Abstract: An electron gun system is described for generating a high current collimated beam of electrons for use in a shaped beam cathode ray tube system. The electron gun includes a cathode having an electron emitting surface for generating free electrons, a collimating grid axially spaced from the cathode and having a central aperture, and a control grid axially spaced from the collimating grid and having a central aperture axially aligned with the aperture of the collimating grid. The control grid receives a varying potential for establishing an electric field which is substantially axial over at least a central portion of the electron beam so as to collimate the beam axially.
    Type: Grant
    Filed: November 4, 1975
    Date of Patent: June 28, 1977
    Assignee: Stromberg Datagraphix Inc.
    Inventor: Dan Joseph Haflinger
  • Raster centering circuit
    Patent number: 4032819
    Abstract: A convergence circuit coupled in parallel with a deflection winding are AC coupled to an output terminal of a deflection amplifier. Rectifiers in the convergence circuit are poled such that the deflection amplifier output current is assymmetrically loaded during the trace portion of each deflection cycle, causing a net direct current of a first polarity through the deflection winding which off-centers the raster. A direct current path coupled in shunt with the yoke coupling capacitor permits conduction of a direct current of a second polarity through the deflection winding for controlling the centering of the raster.
    Type: Grant
    Filed: July 30, 1975
    Date of Patent: June 28, 1977
    Assignee: RCA Corporation
    Inventors: Michael Lee Henley, Lawrence Edward Smith
  • Two-frequency instrument landing system with integral monitor
    Patent number: 4032920
    Abstract: A two-frequency capture-effect instrument landing system employs a single localizer antenna array for both course-frequency and clearance-frequency radiation. The composite course and clearance signals are formed by networks that utilize trees of hybrid power dividers to effect unequal power division and distribute the signals to the antenna feeders. Integral monitoring is provided by similar networks, operating backwards in a functional sense, which recombine samples of the RF energy on the antenna elements and separate the same into the basic, frequency-separated course and clearance signal components. Redundant monitoring for antenna fault detection is provided by detecting RF signal levels on unused ports of the monitor circuit power dividers.
    Type: Grant
    Filed: September 2, 1975
    Date of Patent: June 28, 1977
    Assignee: Wilcox Electric, Inc.
    Inventors: Edwin J. Martin, Jr., Akemichi Yamada
  • Channel structure for multi-channel electron multipliers and method of making same
    Patent number: 4031423
    Abstract: An electron multiplier channel structure having channel walls formed of alternate strips of different glasses. One glass has optimum electrical conductivity properties and the other glass has optimum secondary electron-emitting properties. The strips are contiguous so that electrical conducting strips can readily supply electrons to neighboring electron emitting strips when an electrical potential is applied across the multi-channel structure.
    Type: Grant
    Filed: April 30, 1969
    Date of Patent: June 21, 1977
    Assignee: American Optical Corporation
    Inventor: Walter P. Siegmund
  • Vertical deflection circuit
    Patent number: 4031430
    Abstract: This invention relates to improvements in a vertical deflection circuit employing a class D amplifier. The circuit comprises a pulse width modulator for converting a sawtooth waveform signal to a width modulated pulse train, a switch mode power amplifier for amplifying said width modulated pulse train, a demodulating filter circuit for demodulating said width modulated pulse train to the sawtooth waveform, a damping circuit for preventing a significant power loss in said demodulating filter circuit and a deflection yoke coupled to said demodulating filter circuit, thereby making it possible to reduce power dissipation in the circuit.
    Type: Grant
    Filed: November 12, 1975
    Date of Patent: June 21, 1977
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Shigeru Enomoto
  • Circuit arrangement in a television receiver, provided with a line deflection circuit and a switched supply voltage circuit
    Patent number: 4028589
    Abstract: In a television receiver including a line frequency switched supply voltage circuit and a line deflection circuit in which a first loop is constituted by a winding of the voltage circuit, a winding of the second circuit, a capacitor and a diode. A second loop comprises the control means of the line deflection switch and windings coupled to the above-mentioned windings.
    Type: Grant
    Filed: January 21, 1976
    Date of Patent: June 7, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Oswald Johannes Verbeij
  • Arrangement for varying the excitation of a deflection circuit in response to load changes and the like
    Patent number: 4028588
    Abstract: An arrangement for varying the triggering phase of a thyristor or other controllable switch employed to vary the excitation of a sweep deflection circuit during changes in the circuit load is described. The output of a winding of the deflection transformer is converted to a constant-amplitude sawtooth voltage which has a DC component proportional to the amplitude of the then-occurring forward sweep portion of the sweep voltage. A zener diode or other comparison element coupled to the output of a variable voltage divider whose input is fed by the resulting sawtooth voltage generates a trigger pulse for the controllable switch at the instant, during each cycle of the sweep waveform, that the constant-amplitude sawtooth voltage exceeds a predetermined value.
    Type: Grant
    Filed: December 17, 1975
    Date of Patent: June 7, 1977
    Assignee: Loewe-Opta GmbH.
    Inventor: Heinz Kraus
  • Circuit for generating a correction current for correcting for deflection errors on the display screen of a color television display tube
    Patent number: 4028585
    Abstract: A circuit in a color television receiver for generating a correction current of field frequency for a quadripolar winding which is positioned on the core of the deflection coil. The circuit is in series with the deflection coil and constitutes a bridge circuit with diodes and resistors. A resistor is included in one diagonal branch and the winding in the other.
    Type: Grant
    Filed: March 11, 1976
    Date of Patent: June 7, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus Hubertus Kantelberg, Leonardus Albertus Antonius Valkestijn
  • Parabolic current generator
    Patent number: 4028586
    Abstract: A bridge circuit has its input terminals coupled in parallel with an impedance network through which a sawtooth current is passed, the bridge operating to provide an approximate parabolic current through a load coupled to its output terminals. The impedance network includes at least a first impedance coupled in parallel with a series coupled variable second impedance and a third impedance for improving the stability of the parabolic load current.
    Type: Grant
    Filed: February 2, 1976
    Date of Patent: June 7, 1977
    Assignee: RCA Corporation
    Inventor: Lewis Irwin Mengle
  • Device for displaying color television images
    Patent number: 4027219
    Abstract: A color television display tube comprising at least eight correction coils, arranged in one plane about the tube neck, for controlling the static convergence and possibly other aspects such as color purity.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: May 31, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Willem Meijndert Van Alphen, Piet Gerard Joseph Barten, Johannes Van Den Boogert, Joris Adelbert Maria Nieuwendijk, Jan Gerritsen, Adrianus Hubertus Kantelberg
  • Transducer drive circuit for remote control transmitter
    Patent number: 4027280
    Abstract: A wide bandwidth, ultrasonic frequency transducer drive circuit incorporates a first unidirectional signal path from a source of drive signals to the transducer. A second unidirectional signal path from the source of drive signals couples signals away from the transducer. A circuit resonant with the transducer causes a relatively high signal voltage to be developed across this transducer.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: May 31, 1977
    Assignee: RCA Corporation
    Inventor: Billy Wesley Beyers, Jr.
  • Mobile direction comparator
    Patent number: 4025924
    Abstract: A Mobile Directional Comparator (MDC) used in combination with a communications receiver to process received signal information from a two port antenna system to drive a directional indicator. A radio frequency modulator modulates two received cardioid antenna signal patterns with two low frequency sine wave signals at a low modulation percentage and out of phase with each other. The two modulated cardioids are then combined in a hybrid circuit to produce a non-directional radio frequency signal pattern with respect to the antennae center axis. The combined modulated rf signal is carried through the receiver as a normal signal, and the intermediate frequency output of the receiver is processed by a phase demodulator in the MDC to extract from the signal phase and amplitude information to drive the directional indicator.
    Type: Grant
    Filed: September 10, 1975
    Date of Patent: May 24, 1977
    Assignee: The United States of America as represented by the Field Operations Bureau of the Federal Communications Commission
    Inventors: Arthur Luedtke, William Ferrel Bentley
  • Circuit for generating a deflection current through a coil for the vertical deflection in a display tube
    Patent number: 4024433
    Abstract: A field deflection output circuit in which the end of the deflection coil which is not connected to the output amplifier is coupled with a terminal of a voltage source during the scan period and with the other terminal of this voltage source during the flyback period.
    Type: Grant
    Filed: September 17, 1975
    Date of Patent: May 17, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Jan Abraham Cornelis Korver
  • Circuit arrangement in an image display apparatus for (horizontal) line deflection
    Patent number: 4024432
    Abstract: Line deflection circuit in which the deflection coil is east-west modulated. In order to cancel an east-west dependent horizontal linearity defect the inductance value of the linearity correction coil is made independent of the field frequency, for example by means of a compensating current. In an embodiment this current is supplied by the shunt coil of the east-west modulator.
    Type: Grant
    Filed: July 22, 1975
    Date of Patent: May 17, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Antonius Boekhorst
  • Electronic file and record keeper for secondary radar targets
    Patent number: 4024538
    Abstract: A warning is provided when a responding IFF target fails to satisfy friencceptance criteria in response to a given number of cryptographic interrogations. Target position information is utilized to aid in determining whether the responses under evaluation come from the same target.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: May 17, 1977
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Walton B. Bishop
  • Wireless marine navigational aid system
    Patent number: 4024491
    Abstract: A marine navigational aid system in which at least two marine aids, such as lights, are controlled, such as synchronized, relative to each other without the units being connected with an electrical cable. A marine navigational aid system having an underwater sonic transmitter and receiver for transmitting and receiving coded acoustical signals for controlling navigational aids. A typical installation would consist of a transmitter and a receiver each of which is connected to and actuates a navigational aid. The transmitter sends a complex synchronizing code underwater to the receiver. If the receiver detects and decodes the signal, the receiver is synchronized relative to the transmitter. Both the transmitter and receiver have master clocks which are self-actuated, but the clock of the receiver is controlled and is resettable by a properly decoded signal from the transmitter.
    Type: Grant
    Filed: July 18, 1975
    Date of Patent: May 17, 1977
    Assignee: Tideland Signal Corporation
    Inventors: William Dodd Pellerin, Peter Webb Higgins, Joseph Henery Parnell, III
  • Imaging systems
    Patent number: 4023175
    Abstract: Echo data relating to the distance away of reflective elements of an object surface is received by an array of receivers. A signal processing device receives the data and together with information as to the range of the object surface defines equitime loci of the object surface corresponding to the data. Image elements are displayed at positions in an image plane corresponding to the intersections of the equitime loci.
    Type: Grant
    Filed: October 22, 1975
    Date of Patent: May 10, 1977
    Inventors: Robin Charles Armstrong Brown, Julian Dow
  • Beacon tracking display system
    Patent number: 4023176
    Abstract: A display system is disclosed for use in connection with a beacon tracking receiver. The display system provides both audible and visual displays for use in locating a source of radio transmission. The display includes an audible tone signal to indicate the reception of a desired signal and with a frequency indicative of the distance to the transmitter. The visual display includes the direction as well as the distance to the transmitter. Also disclosed is a new switching means for use in activating the transmitter of a beacon tracking system.
    Type: Grant
    Filed: April 2, 1975
    Date of Patent: May 10, 1977
    Assignee: Texas Instruments Incorporated
    Inventors: Harry A. Currie, William F. Heathcock