Patents Represented by Attorney Richard J. Donahue
  • Patent number: 4546268
    Abstract: A pulse generator circuit for providing pulses having pulse widths in the order of one nanosecond. The circuitry utilizes NPN microwave transistors exclusively to achieve this result.
    Type: Grant
    Filed: December 8, 1983
    Date of Patent: October 8, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Stephen P. Caldwell, David R. Pedersen
  • Patent number: 4536658
    Abstract: A two dimensional focal plane array of Schottky internal emission photodiodes which sense radiation in their metallic regions on a silicon substrate for infrared imaging. The array is designed for mating with multiplexing circuitry via hybrid bump bonding techniques.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: August 20, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Charlotte E. Ludington
  • Patent number: 4533933
    Abstract: A Schottky barrier diode formed of iridium-silicon material having a frequency response encompassing the 3.0 to 5.0 micrometer infrared band. The bandwidth, uniformity of response and silicon base material of such diodes renders them ideally suited for use in large scale focal plane arrays associated with infrared cameras.
    Type: Grant
    Filed: December 7, 1982
    Date of Patent: August 6, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Paul W. Pellegrini, Charlotte E. Ludington, Aleksandar Golubovic, Melanie M. Weeks
  • Patent number: 4531055
    Abstract: A two dimensional focal plane array of Schottky photodiodes on a silicon substrate for infrared imaging. The array is designed for mating with multiplexing circuitry and has a self-guarding feature wherein adjacent Schottky electrodes act as guard electrodes. This feature allows a substantial increase of the focal plane area coverage ratio.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: July 23, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Freeman D. Shepherd, Jr., Paul W. Pellegrini, Charlotte E. Ludington, Melanie M. Weeks
  • Patent number: 4528549
    Abstract: A bipolar digitizer (A/D converter) is disclosed which uses a single comparator circuit for initially determining the polarity of a sampled input signal and for thereafter comparing the absolute magnitude of the signal to an applied ramp voltage. The time required for the ramp voltage to exceed the magnitude of the sampled input signal is converted into a digital waveform representative of the magnitude of the sampled input signal. Resistive means are selectively connected in shunt with a signal storage capacitor to achieve bipolar signal compression and increased dynamic range.
    Type: Grant
    Filed: January 27, 1983
    Date of Patent: July 9, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: James E. Simpson
  • Patent number: 4523293
    Abstract: A two-dimensional bulk acoustic wave correlator-convolver having an acoustic mirror positioned two focal lengths from an integrated circuit-acoustic transducer array. The image, rather than the Fourier transform, of the input spatial distribution is returned to the transducer array by the mirror.
    Type: Grant
    Filed: April 5, 1983
    Date of Patent: June 11, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Bert A. Auld, Donald W. Pettibone, James D. Plummer
  • Patent number: 4523198
    Abstract: Multiple beam antennas are modified and improved through the use of lenses coupled together by hybrid junctions. A dual lens structure avoids circulators while permitting the lenses to be used both for transmission and for reception. A six lens structure provides perfect phase focusing utilizing an R-2R geometry with a Mobius topology, giving 360 degrees of independent antenna beams from a single circular or cylindrical antenna array.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: June 11, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Roger E. Clapp
  • Patent number: 4521656
    Abstract: A safety device for discharging high voltage circuits operated in pressurized containers. The device is positioned within an elbow or other protrusion through which passes the high voltage feed-through electrode. In one embodiment the grounding contact is automatically forced against the high voltage contact by the expansion of a bellows upon decompression of the container while in an alternate embodiment, the grounding contact is manually threaded against the high voltage contact.
    Type: Grant
    Filed: November 8, 1983
    Date of Patent: June 4, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Jon W. Ogland
  • Patent number: 4521893
    Abstract: A system for communicating a time reference or clock signal to a plurality of processors over substantial distances where propagation time between units is significant compared to the processing time. The timing signal is in the form of two continuous sinusoidal waves of different frequency but equal amplitude, which are added to give equal contributions in the resultant composite, two frequency, sum signal. The resulting waveform has sharply defined nulls occurring at the difference frequency which are used as a precise time reference.
    Type: Grant
    Filed: April 21, 1983
    Date of Patent: June 4, 1985
    Assignee: The Unites States of America as represented by the Secretary of the Air Force
    Inventor: Brian M. Bellman
  • Patent number: 4517618
    Abstract: Protection circuitry interposed between a power source and a load is arranged to gradually apply high voltage to the load until the voltage has attained a predetermined percentage of its nominal value. In the event that the load current exceeds a prescribed maximum limit, or in the absence of additional load voltages, the high voltage supply is disconnected from the load.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: May 14, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: G. Haven Frank
  • Patent number: 4511216
    Abstract: A high power laser dump having defined laser beam introduction angles to the internal surface of a cylinder to maximize energy dispersion and absorption and having two zones formed of distinctive reflective and absorbing materials.
    Type: Grant
    Filed: August 23, 1983
    Date of Patent: April 16, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Michael S. Hsu, James P. Hsu
  • Patent number: 4495505
    Abstract: A coplanar printed circuit balun for connecting an unbalanced feedline to a balanced dipole antenna.
    Type: Grant
    Filed: May 10, 1983
    Date of Patent: January 22, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Michael W. Shields
  • Patent number: 4066037
    Abstract: Disclosed are apparatus for forming dense and tightly adhering dielectric films on the surface of conductors, semiconductors, and insulators. The apparatus includes a reaction chamber into which a gas is admitted, dispersed, and subjected to a radio frequency exciting field to form a highly luminous glow discharge zone within the chamber. Another gas is admitted separately and is dispersed downstream from the glow discharge zone, immediately above the substrate to be coated.
    Type: Grant
    Filed: December 17, 1975
    Date of Patent: January 3, 1978
    Assignee: LFE Corportion
    Inventor: Adir Jacob
  • Patent number: 3962559
    Abstract: A transistor with its base-emitter bias controlled by a positive temperature coefficient thermistor provides a controlled heat source for maintaining precise temperature within a small oven which is used to contain and provide a stable temperature for temperature sensitive elements of external circuits.
    Type: Grant
    Filed: January 3, 1975
    Date of Patent: June 8, 1976
    Assignee: LFE Corporation
    Inventors: Benedict J. Drda, Maxwell Meredith
  • Patent number: 3952249
    Abstract: A flat meter assembly with a face displayed along one narrow end in edgewise fashion, the meter movement being mounted entirely in a molded frame and enclosed therein by a U-shaped top and bottom cover applied from the rear and a transparent face cover applied from the front, the two covers snapping together by integral fastenings. A series of lands and grooves along each side of the frame accept spring clips which are loaded by finger pressure and inserted between appropriate grooves and a mounting panel to secure the meter in place.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: April 20, 1976
    Assignee: LFE Corporation
    Inventor: Phillip Colman