Patents Represented by Attorney Howard P. Terry

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  • Transducer for perpendicular magnetic recording
    Patent number: 4317148
    Abstract: The transducer for perpendicular magnetic recording comprises a core of high permeability material having a recording pole and a flux return pole spaced apart and connected by an intermediate member forming an inverted generally U-shaped core. The cross sectional area of the flux return pole is substantially greater than that of the recording pole. Current applied to a coil wound around the recording pole generates flux for recording on the magnetic medium. A similarly shaped second core may be disposed on the opposite side of the medium with respect to the first core for providing a flux return path for the first core. A sub-core of high permeability material mounted on the flux return pole forms a gap with the recording pole to provide a ring-type head for data recovery. Current applied to a coil wound on the sub-core saturates the sub-core to render it ineffective during perpendicular magnetic writing.
    Type: Grant
    Filed: January 24, 1980
    Date of Patent: February 23, 1982
    Assignee: Sperry Corporation
    Inventor: Chao S. Chi
  • Aircraft automatic pilot with automatic emergency descent control apparatus
    Patent number: 4314341
    Abstract: An automatic flight control system includes an automatic emergency descent mode initiated upon cabin decompression at high altitudes. Automatic safe capture of maximum descent rate and automatic flare to a safe altitude are provided, together with an automatic turn off the course existing at mode initiation.
    Type: Grant
    Filed: January 24, 1980
    Date of Patent: February 2, 1982
    Assignee: Sperry Corporation
    Inventor: Gary G. Kivela
  • Stable subsynchronous drive system for gyroscope rotor
    Patent number: 4314188
    Abstract: The present invention concerns apparatus for precisely driving the rotors of precision gyroscopes such as small, flexure mounted rate of turn or inertial gyroscopes. The rotor is servo operated subsynchronously whereby a reference frequency generated by a spin frequency reference generator is synchronized with a precisely stable frequency standard, assuring the maintenance of constant rotor speed and permitting precisely calibrated gyroscope torquing. The gyroscope motor rotor is thus spun at a subsynchronous frequency so that the poles in the hysteresis ring are constantly rotating about the ring and their effect on average magnetic bias is averaged substantially to zero. Further, the drive motor is operated at peak efficiency because its excitation is automatically and closely adjusted to be just sufficient to generate only the necessary motor torque for subsynchronous operation.
    Type: Grant
    Filed: March 15, 1979
    Date of Patent: February 2, 1982
    Assignee: Sperry Corporation
    Inventor: Henry K. Voigt
  • Collision avoidance apparatus
    Patent number: 4313115
    Abstract: Collision avoidance apparatus for assessing manoeuvres of a first vehicle (6) to avoid collision with other vehicles (22) in which closed regions are computed respectively associated with the other vehicles and which, if avoided by the first vehicle, will assure that the latter will not pass closer to the other vehicles than a predetermined distance (CPA).
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: January 26, 1982
    Assignee: Sperry Limited
    Inventor: James P. O'Sullivan
  • Transient free synchronization system
    Patent number: 4312039
    Abstract: An aircraft automatic yaw stabilization system with heading hold and manual command override capability provides circuit means responsive to the manual commands for suppressing heading transients in commmanding a heading change and in the ultimate capture of a desired heading.
    Type: Grant
    Filed: January 24, 1980
    Date of Patent: January 19, 1982
    Assignee: Sperry Corporation
    Inventor: Edmund R. Skutecki
  • Sieve overload sensor for alerting the operator of a combine of a sieve overload condition
    Patent number: 4311995
    Abstract: Apparatus for indicating, to the operator of a combine, that a sieve overload or blockage has developed comprises wind sensors responsive to the fan air flow within the cleaning section of the harvester. The flow sensor signals are compensated for the ambient temperature within the combine such that they are independent thereof. The apparatus includes a monitor circuit for detecting a low flow indicative of blockage or overload and warning means responsive thereto to alert the operator.
    Type: Grant
    Filed: November 23, 1979
    Date of Patent: January 19, 1982
    Assignee: Sperry Corporation
    Inventor: George R. Kinzie
  • Fluid supply systems
    Patent number: 4308721
    Abstract: The invention relates to a fluid supply system and seeks to provide a simpler, safer but reliable system than at present known. The fluid supply system comprises a multi-charge solid propellant gas generator and a fluid expulsion unit integrated into a single unit, the gas generator being provided in a cap (8) for a chamber (1) having a gas portion (3) and a fluid portion (2) and a movable partition (4) between these two portions operable to expel fluid from the chamber when the gas generator is rendered operative. The system also comprises ignition control means (22) operable to control the ignition of the solid propellant charges (13) when required to give a fully controllable system output.The system can be designed for supplying under pressure fluids such as hydraulic oil, fuels, oxidants and water and is particularly useful in aerospace applications.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: January 5, 1982
    Assignee: Sperry Limited
    Inventors: Alan V. Thomas, Geoffrey E. Bone
  • Overload protection for a voltage conversion circuit
    Patent number: 4308576
    Abstract: A voltage converter of the transformer type which incorporates at least one switching transistor coupled to control the application of current to the transformer primary and circuitry for switching the transistor on and off to control the current through the primary winding. When the output of the converter is shorted, the switching rate undesirably increases causing potential damage to the converter. A frequency detecting circuit detects the increase in switching frequency and acts to reduce the input voltage to the converter to prevent damage thereto.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: December 29, 1981
    Assignee: Sperry Corporation
    Inventor: Charles A. Clark, Jr.
  • Digital discriminator for determining frequency error of an oscillator
    Patent number: 4305151
    Abstract: An adjustable alternating signal having a desired period, P, is applied to a cycle counter arranged to count n cycles and applied to a timer arranged to time out n.multidot.P after a first cycle is applied to the counter and timer. A comparator is coupled to the counter and timer to determine whether the counter reaches its count of n cycles first or whether the timer times out first indicating that the period of the alternating signal is shorter or longer, respectively, than desired. An integrator is responsive to the signal from the comparator for changing the alternating signal which achieves the desired period.
    Type: Grant
    Filed: May 31, 1979
    Date of Patent: December 8, 1981
    Assignee: Sperry Corporation
    Inventors: Henry C. Johnson, Ronald W. Kipp
  • North finder with optical transfer provision
    Patent number: 4302885
    Abstract: A portable gyroscopic compass surveying device includes means for rapidly aligning the apparatus with respect to geographic north, the north finder itself being operated apart from the associated theodolite on its own low mount. The transfer of the azimuth reference data is accomplished optically by sighting the theodolite telescope on a retro-reflector associated with the north finder. Because the north finder is physically separated from the theodolite, sightings may be made by the theodolite operator while the undisturbed north seeking operation is in process, significantly shortening the total time of operation at each station.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: December 1, 1981
    Assignee: Sperry Corporation
    Inventors: Seymour Levine, Willis G. Wing
  • Multiple terminal passive multiplexing apparatus
    Patent number: 4302835
    Abstract: An apparatus for multiplexing a plurality of sensor signals onto a common transmission line without employing electrically active devices at each sensor. A modulated carrier signal is coupled to propagate along the common transmission line to a plurality of sensor terminals wherefrom portions of the carrier signal energy are coupled to the sensors for the inclusion of data signals and returned therefrom to propagate through a common transmission line to a common demodulator. Modulated carrier signals from each sensor are distinguished by providing a different round trip path length for each sensor, thus establishing unique round trip time delays.
    Type: Grant
    Filed: January 24, 1980
    Date of Patent: November 24, 1981
    Assignee: Sperry Corporation
    Inventor: Donald H. McMahon
  • Deflection amplifier system for raster scanned cathode ray tube displays
    Patent number: 4302708
    Abstract: An efficient cathode ray deflection amplifier is provided having a selectable scan rate capability, providing sweep rate linearity through the use of a feed back arrangement that also cooperates in a self-adaptive manner with respect to commanding changes in the raster scan rate or display size.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: November 24, 1981
    Assignee: Sperry Corporation
    Inventor: Thomas W. Spilsbury
  • Resonant acoustic transducer system for a well drilling string
    Patent number: 4302826
    Abstract: For use in transmitting acoustic waves propagated along a well drilling string, a piezoelectric transducer is provided operating in the relatively low loss acoustic propagation range of the well drilling string. The efficiently coupled transmitting transducer incorporates a mass-spring-piezoelectric transmitter combination permitting resonant operation in the desired low frequency range.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: November 24, 1981
    Assignee: Sperry Corporation
    Inventors: William H. Kent, Peter G. Mitchell
  • Fiber optic transducer and method of manufacture therefor
    Patent number: 4300813
    Abstract: An optical transducer for converting pressure variations to variations in amplitude of an optical signal. A first optical transmission line is positioned above a base in a manner to maintain its end face stationary while a second optical transmission line is positioned above the base in a manner to permit the axis to be displaced from the axis of the optical fiber with the stationary end face in accordance with variations of pressure applied thereto. Optical signals propagating in one of the optical transmission lines will couple to the other with a coupling factor dependent upon the axial displacement of the optical fibers. Under conditions of continuous pressure variations, such as that created by an incident acoustic wave, the coupled optical signal will be amplitude modulated in accordance with the pressure variations.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: November 17, 1981
    Assignee: Sperry Corporation
    Inventor: Robert L. Gravel
  • Apparatus for processing digital data representative of a two-dimensional image
    Patent number: 4300122
    Abstract: An apparatus for processing binary data in line sequential format indicative of the presence of selected features in a two-dimensional binary data point array generates corner codes which classify the nature of such selected features. In one embodiment of the apparatus, means are provided for producing data matrices representative of the states of adjacent binary image points in the array; a corner code generator is coupled with the matrix means for producing the corner codes by analyzing the contents of each data matrix.
    Type: Grant
    Filed: April 2, 1979
    Date of Patent: November 10, 1981
    Assignee: Sperry Corporation
    Inventor: Donald H. McMahon
  • Phase match measuring system
    Patent number: 4300092
    Abstract: An apparatus for phase matching transmission lines which generates signals with frequencies and phase characteristics that are representative of the length of the transmission line under test and alternately samples and compares these signals to minimize signal source instabilities.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: November 10, 1981
    Assignee: Sperry Corporation
    Inventor: Harry F. Strenglein
  • Anode voltage deflection gain control for cathode ray displays
    Patent number: 4297618
    Abstract: A compensating gain control system provides improved operation of the deflection channels of cathode ray color displays, particularly a display of the penetration phosphor type. A sample of the indicator anode voltage is taken and the square root of the sample is derived. Each deflection current wave form is multiplied by the square root signal, thus providing a deflection drive current accurately scaled to anode voltage changes.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: October 27, 1981
    Assignee: Sperry Corporation
    Inventor: Thomas W. Spilsbury
  • Cathode ray tube beam deflection amplifier system
    Patent number: 4297621
    Abstract: A cathode ray dual mode electromagnetic beam deflection amplifier system for providing current for driving a deflection coil, and means for switching between linear and resonant non-linear operational modes. In the linear mode, the deflection coil current is controlled to closely follow an applied input deflection sweep voltage and operates as a push-pull amplifier. In the non-linear resonant mode, one-half the output stage is abruptly decoupled from the deflection coil such that energy stored in the deflection coil is discharged into a series capacitor, the subsequent resonant pulse being returned through the non-decoupled half of the output stage to a power supply.
    Type: Grant
    Filed: October 2, 1980
    Date of Patent: October 27, 1981
    Assignee: Sperry Corporation
    Inventor: Thomas W. Spilsbury
  • Magnetic toner apparatus
    Patent number: 4295442
    Abstract: Magnetic apparatus for dispensing toner of an electrophoretic printer having a hopper fed magnetic brush in conjunction with an active or passive magnetic backing plate is disclosed for transferring a uniform layer of toner to a transfer surface or belt for high speed printing purposes. The magnetic apparatus includes a magnetic roller having an inner magnetic surface and an outer cylindrical surface disposed in magnetic relationship to the toner and opposite one side of the transfer surface. The apparatus further includes a magnetic backing plate disposed opposite the other side of the transfer surface and juxtaposed to said magnetic roller for transferring the toner to the transfer surface.
    Type: Grant
    Filed: August 4, 1978
    Date of Patent: October 20, 1981
    Assignee: Sperry Corporation
    Inventor: James B. Thaxter
  • Parametric array Doppler sonar apparatus
    Patent number: 4296482
    Abstract: Parametric array Doppler sonar apparatus includes an acoustic lens containing a flat disk-like central portion and an annular outer portion serving as a convergent lens. Multiple transducers are positioned between the lens and the focal plane so as to launch collimated acoustic beams in specified directions through the central portion of the lens and to receive reflected energy propagating principally through the annular portion of the lens.
    Type: Grant
    Filed: March 24, 1980
    Date of Patent: October 20, 1981
    Assignee: Sperry Corporation
    Inventor: Jacob A. Kritz