Patents Examined by Marvin L. Nussbaum
  • Patent number: 4841259
    Abstract: A four-pole or three-pole structure adapted to propagate an electromagnetic wave, such as an electrical line or cable or electronic component, comprises a lossy non-linear dielectric material distributed in a wave propagation direction. This material has a non-linear conduction characteristic whereby it is substantially non-conductive at any rated applied voltage of the structure and substantially conductive at any abnormally high applied voltage. It consists of a polycrystaline material comprising thin interstitial layers procuring a tunneling or Schottky type effect in response to a high electric field resulting from such abnormally high applied voltages. It absorbs both voltage surges (varistor effect in the time domain) and high-speed transients (lowpass filter effect in the frequency domain). The structure can be used to provide protection against lightning strikes, nuclear electromagnetic pulses, electrostatic discharges and radio-frequency interference in general.
    Type: Grant
    Filed: September 16, 1987
    Date of Patent: June 20, 1989
    Inventor: Ferdy Mayer
  • Patent number: 4841264
    Abstract: A ladder-type ceramic filter is formed of a plurality of series and parallel resonators arranged in series and in parallel between the input and output terminals. In this filter, a series resonator on the side of the input terminal has a resonant frequency lower than those of other series resonators and an antiresonant frequency higher than those of other series resonators. Further, a parallel resonator on the side of the output terminal has a resonant frequency lower than those of other parallel resonators and an antiresonant frequency higher than those of other parallel resonators.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: June 20, 1989
    Assignee: Toko Kabushiki Kaisha
    Inventor: Michitaka Oshikawa
  • Patent number: 4839748
    Abstract: An initial state setting system in a still picture recording and reproduction device in which a video signal is read from a disk and written into a memory and then repeatedly read from the memory for still picture display. When power is first applied to the device characterizing information recorded on the disk is immediately read into the memory.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: June 13, 1989
    Assignee: Pioneer Electronic Corporation
    Inventor: Tsuneo Ishii
  • Patent number: 4839617
    Abstract: A bandpass filter comprises a reactively intercoupled pair of parallel-resonant circuits (1, 2) to one of which a pair of signal input terminals (15, 16) are connected and to the other of which a pair of output terminals (17, 18) are connected. Tuning of the filter is accomplished by varying the capacitive component of each circuit by means of a tuning voltage applied to a further input (19). In order to compensate for the deviation from the optimum intercoupling which would otherwise occur with change of tuning frequency the capacitive component of each resonant circuit comprises at least three capacitors (5, 6, 7 and 8, 9, 10) in series, each set of three capacitors effectively forming a variable capacitive voltage divider. The two junction points of the three capacitors of each set are each connected to the corresponding junction point in the other set by means of a respective bidirectional reactive coupling (13 and 14 respectively).
    Type: Grant
    Filed: November 22, 1988
    Date of Patent: June 13, 1989
    Assignee: U.S. Philips Corporation
    Inventor: John D. Speake
  • Patent number: 4839618
    Abstract: A monolithic coupled-dual resonator crystal filter is produced for operation with wide bandwidths (especially at high center frequencies) by providing an ultra-small gap between juxtaposed resonator electrodes. A gap width of substantially less than 0.006 inch is obtained by laser-machine trimming the gap. An initial single electrode may thus be divided into a pair of such juxtaposed resonator electrodes. Further metallic plate-back is provided on the electrodes for center-frequency control. Although this typically may decrease the coupling bandwidth somewhat, an increased thickness of metallic plate-back material on the ground electrode, opposite the ultra-thin gap area on the active side of the crystal wafer, provides precisely controlled extra wide bandwidth.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: June 13, 1989
    Assignee: General Electric Company
    Inventors: Gerald E. Roberts, A. Gordon Staples, Samuel Toliver
  • Patent number: 4837533
    Abstract: A ladder-type ceramic filter formed of a plurality of series and parallel resonators arranged in series and in parallel between the input and output terminals. In this filter, resonators are arranged in a manner that a resonator (or resonators) in which each difference between resonant and antiresonant frequencies thereof is minimum is (or are) positioned in the center of the resonator arrangement, and that resonators in which respective differences between resonant and antiresonant frequencies thereof are a larger value or values are positioned on the sides of the input and output terminals, respectively.
    Type: Grant
    Filed: July 19, 1988
    Date of Patent: June 6, 1989
    Assignee: Toko Kabushiki Kaisha
    Inventor: Michitaka Oshikawa
  • Patent number: 4837638
    Abstract: A video editing system which utilizes the vertical interval time code address as the sole edit control code in performing a video edit, whereby a time code of the edit point is read from the record videotape and is supplied to an inserting circuit which inserts the code into the vertical blanking period of the video edit signal. Reading and editing are performed by utilizing a modified recorder having a pre-erase video head or a modified reader which supplies a time code to the generator during pre-roll time only, or a modified generator having means to latch a pre-set time code prior to recording. In an alternative embodiment, a system is disclosed which utilizes a small track of a videotape separate from the track containing the main video signal, the smaller track having a segment of the vetical blanking period which contains the time code address recorded thereon.
    Type: Grant
    Filed: August 6, 1987
    Date of Patent: June 6, 1989
    Inventor: John W. Fullwood
  • Patent number: 4837535
    Abstract: A compact resonant wave filter capable of selectively propagating an electromagnetic wave of a prescribed frequency with excellent band-pass wave filter characteristics comprises a TM mode resonator disposed perpendicularly to the direction of propagation of electromagnetic wave energy, a pair of TEM mode resonators disposed one on either side or said TM mode resonator in the direction of propagation of electromagnetic wave energy, and a pair of cutoff waveguides disposed one between said TEM mode resonator and each of said TM mode resonators to couple said TEM mode resonator with said TM mode resonators in evanescent mode.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: June 6, 1989
    Assignee: Uniden Corporation
    Inventors: Yoshihiro Konishi, Kenichi Konno, Ikuo Awai
  • Patent number: 4835498
    Abstract: A tunable, microwave filtering device comprises a microstrip line, a dielectric resonator capable of being coupled to the microstrip line, a coplanar line capable of being coupled to the resonator, an active element, such as a varactor for example, mounted on the coplanar line, the variable impedance of which enables the frequency tuning of the device. The invention can be applied to the making of a tunable microwave frequency discriminator, the making of a microwave oscillator and the frequency stabilization of a tunable oscillator.
    Type: Grant
    Filed: June 6, 1988
    Date of Patent: May 30, 1989
    Assignee: Thomson-CSF
    Inventors: Jean-Michel Rouger, Gilles Denis, Bernard Liabeuf
  • Patent number: 4835497
    Abstract: An ac line filter comprises two main cores, at least one auxiliary core disposed between the two main cores, and a pair of windings provided on the main and the auxiliary core. The main cores form shell type closed magnetic paths and enclose the auxiliary core, which forms a closed magnetic path, when the two main cores are placed one over the other. Each of the windings is wound in a concentrated manner to surround both the inner core of the main core and the auxiliary core at a location where the auxiliary core is positioned beside the main core, and is wound in a spaced manner around the inner core of the main core at a location where the auxiliary core is not positioned adjacent the main core. Each winding is divided at the center thereof and the divided ends of one winding are cross-connected with the similar divided ends of the other winding.
    Type: Grant
    Filed: September 20, 1988
    Date of Patent: May 30, 1989
    Assignees: Nippon Telegraph and Telephone Corporation, Sanritsu Electric Company, Ltd.
    Inventors: Kusuo Takagi, Yuuzaburo Inoue
  • Patent number: 4833428
    Abstract: A duplexer for use in a feed network for a satellite communications antenna is made in waveguide form and comprises two plate halves each with a pattern of channels on one surface, the pattern on one half being the mirror image of the pattern on the other. When the two halves are assembled with the patterned faces juxtaposed, a receive filter and a transmit filter with receive, transmit and common ports are obtained. Each filter has a main waveguide and several short-circuited half wavelength stubs in serial connection to the main waveguide. The joint between the two halves bisects the waveguide broadwall and is, therefore, of no electrical significance. The simplicity of the design lends itself to fabrication as part of a bigger integral assembly consisting of duplexers and other feed components. After manufacture, no further tuning is necessary.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: May 23, 1989
    Inventors: Chuck K. Mok, Alain Martin
  • Patent number: 4833430
    Abstract: A dual-coupled resonator crystal is fine-tuned by frequency balancing the input and output resonators and thereafter plating a coupling adjust spot on the grounded side shadowing the unelectroded region of the front side of the crystal to produce a change in synchronous peak separation frequency. Thereafter, the front side electrodes are sequentially plated to bring plateback and synchronous peak separation frequency to their target values. Interim adjustments in synchronous peak separation frequency may be made during the tuning process to compensate for misalignment of the plating elements.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: May 23, 1989
    Assignee: General Electric Company
    Inventors: Gerald E. Roberts, Samuel Toliver, Robert J. Crescenzi
  • Patent number: 4833429
    Abstract: A quadrature coil combiner for phase shifting the pulses and signals of a quadrature coil system used in magnetic resonance (MR) systems to selectively combine or cancel the pulses and signals transmitted and received. The combiner comprises a first and a second conductor for coupling a first and a second coil respectively of the quadrature coil system to a transmit-receive circuit of the MR system. The first conductor comprises an insertable .pi./2 radian delay. The second conductor includes a fixed .pi./2 radian delay. At least one of either the fixed delay or the insertable delay is a quarter wavelength cable whereby active elements are minimized.
    Type: Grant
    Filed: May 17, 1988
    Date of Patent: May 23, 1989
    Assignee: Elscint, Ltd.
    Inventors: Hanan Keren, Itzchak Linenberg
  • Patent number: 4831533
    Abstract: A control system for controlling the fuel/air supply to the engine of an automotive vehicle comprises a sensor which is located adjacent a foot throttle pedal and operative to sense the position to which the pedal is moved, and also to generate signals corresponding to the sensed foot pedal position, and also comprises a vehicle speed sensor which is arranged to generate a signal corresponding to the speed of the vehicle. A control unit is arranged to receive as input signals at least the signal generated by the foot pedal sensor and the signal generated by the speed sensor. The control unit operates with two functions, namely a speed function which is contingent on the position of the foot pedal, and a base function for the fuel/air supply to the vehicle motor, this base function being contingent on at least the position of the foot pedal.
    Type: Grant
    Filed: June 3, 1987
    Date of Patent: May 16, 1989
    Assignee: AB Volvo
    Inventor: Per-Harald Skoldheden
  • Patent number: 4829274
    Abstract: A multiresonator dielectric block filter is disclosed in which capacitive coupling between resonators disposed in the dielectric block is controlled by an electrode strip coupled to the conductive material covering the majority of the dielectric block surface. The electrode strip extends at least partially between two adjacent resonators to control the capacitive coupling between the resonators.
    Type: Grant
    Filed: September 3, 1987
    Date of Patent: May 9, 1989
    Assignee: Motorola, Inc.
    Inventors: Steven R. Green, David M. De Muro, Raymond L. Sokola
  • Patent number: 4829273
    Abstract: A frequency characteristic of a surface acoustic wave filter having at least a first transducer and a second transducer is determined by a product of a frequency amplitude characteristic of the first transducer and that of the second transducer so that the electrodes of the both transducers are formed in such a way that third harmonics band in the frequency characteristic of the first transducer is shifted out that of the second transducer in order to prevent third harmonics.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: May 9, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masao Nozaki, Yoshihiro Yasuhara
  • Patent number: 4829272
    Abstract: An electromagnetic variable delay line system in which the change in the output impedance of the delay line as its delay time is varied is compensated by an electronic device such as a field effect transistor which is connected across the output end of the variable delay line system. Therefore, generation of undesirable reflected waves can be prevented and high speed signals can be processed without distorting the signals.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: May 9, 1989
    Assignee: Elmec Corporation
    Inventor: Kazuo Kameya
  • Patent number: 4827228
    Abstract: An in-line filtering device for a telecommunications line having an insulation displacement connection member located within a channel formed in a dielectric housing. The connection member is devoid of a wire terminal. A ground line is connected to the connector member, the ground line including a radio frequency filter. The channel is open-ended at both ends to allow an insulated conductor wire to pass, without a break in the wire, completely along the channel and out from both ends with the conductor wire electrically connected to the insulation displacement connection member.
    Type: Grant
    Filed: November 13, 1986
    Date of Patent: May 2, 1989
    Assignee: Northern Telecom Limited
    Inventor: Roy D. Blakely
  • Patent number: 4827229
    Abstract: A bulk acoustic wave spectrum analyzer and channelizer, using bulk acoustic wave beams in a body of material having the property of conducting bulk acoustic wave beams, including acoustically reflecting surfaces. An input transducer is positioned upon one surface of the body for launching acoustic beams into the body. At least one output transducer set, including a plurality of aligned, juxtaposed electrodes are placed on the outer surfaces of each of the output transducers of the transducer sets.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: May 2, 1989
    Assignee: Litton Systems, Inc.
    Inventors: Farhang Sabet-Peyman, I-Cheng Chang
  • Patent number: 4827230
    Abstract: A ferrimagnetic resonator has improved high frequency response because a shorter, tapered pole shaft is substituted for the longer pole shafts of uniform dimensions in the prior art. This shorter, tapered shaft alleviates constrictions in the field of the magnetic flux, thus allowing for an improved flux density at the tip of the magnet and correspondingly improved high frequency operation of the ferrimagnetic resonator. In a preferred embodiment, the tip of the pole is replaced with a layer of a higher permeability, but also higher hysteresis, alloy to improve the flux density in the air gap where the ferrimagnetic crystal resonator elements reside. In alternative embodiments, the case end of the pole shaft can attain its greater dimensions because of sides that curve outward or that get larger in a series of steps.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: May 2, 1989
    Assignee: Tektronix, Inc.
    Inventor: David L. Harris