Patents Represented by Attorney Donald R. Campbell

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  • Ultrasonic bond testing of semiconductor devices
    Patent number: 4366713
    Abstract: The bond between a structured copper heat sink member and a semiconductor wafer is inspected for voids and unbonds by a focused ultrasonic pulse transmission method. The small focused spot of ultrasound is transmitted along the structured copper strands and is attenuated in the lateral direction. The absence of a received pulse or a significantly reduced amplitude signal, as the assembled device is scanned with acoustic pulses, indicate flaws in the bond.
    Type: Grant
    Filed: March 25, 1981
    Date of Patent: January 4, 1983
    Assignee: General Electric Company
    Inventors: Robert S. Gilmore, Homer H. Glascock, II, Harold F. Webster
  • Ultrasonic transducer for single frequency applications
    Patent number: 4366406
    Abstract: An ultrasonic transducer has two impedance matching layers bonded to the transducer element which have different thicknesses and are 90.degree.-100.degree. and 35.degree.-55.degree. matching layers. This structure has a high sensitivity comparable to a broadband front surface matched transducer with quarter wavelength (90.degree. and 90.degree.) matching layers, and has primarily a single resonant mode so as to be suitable for relatively narrow band applications.
    Type: Grant
    Filed: March 30, 1981
    Date of Patent: December 28, 1982
    Assignee: General Electric Company
    Inventors: Lowell S. Smith, Axel F. Brisken
  • Fluid cooled solar powered photovoltaic cell
    Patent number: 4361717
    Abstract: Concentrated sunlight impinges on a large area photovoltaic device which is bonded to a highly pliable and thermally and electrically conductive structured copper strain relieving member; the lower face of the structured copper is sealed to a fluid cooled metal heat sink. Large power densities of sunlight are absorbed without appreciable temperature rise. The structured copper accommodates to the difference in expansion between the metal heat sink and the semiconductor wafer. Three embodiments utilize a single planar junction diode, an interdigitated diode, and series connected isolated junction diodes.
    Type: Grant
    Filed: December 5, 1980
    Date of Patent: November 30, 1982
    Assignee: General Electric Company
    Inventors: Robert S. Gilmore, Homer H. Glascock, II, Harold F. Webster
  • Pulse laser pretreated machining
    Patent number: 4356376
    Abstract: An improved laser-assisted machining process has special application to difficult-to-machine materials such as the titanium alloys and high temperature superalloys. A layer of material to be removed by a cutting tool is made weaker by drilling a series of holes using a pulse laser beam ahead of the cutting process so that the tool removes the rest of the weaker material with relative ease. There is a decrease of cutting forces, breakage of the chip to a manageable size, and reduced tool wear.
    Type: Grant
    Filed: May 13, 1981
    Date of Patent: October 26, 1982
    Assignee: General Electric Company
    Inventors: Ranga Komanduri, Minyoung Lee, Donald G. Flom, Robert A. Thompson, Marshall G. Jones, Robert J. Douglas
  • Cutting thin metal sheet with an electron beam
    Patent number: 4356377
    Abstract: Amorphous metal ribbon and thin conventional magnetic material is fully cut through by an electron beam and has no or minimal bead on the edge. The ribbon is bent around a roller while under the electron beam and centrifugal force removes molten metal from the cut. An alternative method is to partially cut through and mechanically deform the material to break the thinned section metal bridges remaining below the cut. Motor laminations so cut have negligible increase in thickness and stack compactly.
    Type: Grant
    Filed: February 19, 1981
    Date of Patent: October 26, 1982
    Assignee: General Electric Company
    Inventors: James F. Norton, Gerald B. Kliman, Russell E. Tompkins
  • Universal lifting magnet
    Patent number: 4350379
    Abstract: An electromagnet on the gripper of an automatic assembly machine has a specially shaped pole piece structure with curved surfaces and flat surfaces, part of which are undercut in depth, to handle several different objects. Motor end bells and rotors in various orientations are picked up and transported during automatic assembly of small motors. There is quick release of light weight parts such as end bells.
    Type: Grant
    Filed: October 10, 1980
    Date of Patent: September 21, 1982
    Assignee: General Electric Company
    Inventor: Donald C. Peroutky
  • Non-contact measurement of surface profile
    Patent number: 4349277
    Abstract: A parallax method of wavelength labeling is based on optical triangulation. A complementary color pattern projected onto the surface is characterized by a continuous variation of the power ratio of two wavelength bands, and the profile can be measured at all points in the field of view. Shifts of the wavelength bands on separate detector arrays correspond to profile deviations. A signal processor calculates a normalized signal that is independent of surface reflectivity and roughness variations; the phase shift of this signal yields depth data from which the surface profile can be mapped.
    Type: Grant
    Filed: June 11, 1980
    Date of Patent: September 14, 1982
    Assignee: General Electric Company
    Inventors: Joseph L. Mundy, Gilbert B. Porter, III, Thomas M. Cipolla
  • Optical character recognition
    Patent number: 4339745
    Abstract: High contrast image data is acquired from metal and other hard surfaces with varying roughness and reflectivity on which characters are impressed by vibrapeening or laser marking. The optical scanner applies normal illumination and a linear photodiode array detects light reflected normal to the surface and within a narrow acceptance angle, so that characters appear dark and the background light. The detector signal is preprocessed to remove nonuniform background variations and yield image data which can be fed to conventional character recognition equipment.
    Type: Grant
    Filed: May 14, 1980
    Date of Patent: July 13, 1982
    Assignee: General Electric Company
    Inventors: William D. Barber, Thomas M. Cipolla, Joseph L. Mundy
  • Detecting internal abnormalities in turbines
    Patent number: 4335600
    Abstract: Undesirable internal changes in a running turbine are diagnosed by monitoring the dynamic pressure of the stream of fluid and the structure-borne vibration of the stationary shell. Incipient erosion of blades, material deposit buildup, and other abnormalities are detected by analyzing the dynamic pressure and vibration signal utilizing several signal processing techniques. A better maintenance schedule can be derived, this also serves as a turbine efficiency monitor.
    Type: Grant
    Filed: November 13, 1980
    Date of Patent: June 22, 1982
    Assignee: General Electric Company
    Inventors: Peter T. Wu, Stephen E. Grabkowski
  • Method for producing gallium arsenide single crystal ribbons
    Patent number: 4336099
    Abstract: The single crystal growth of GaAs is highly anisotropic under certain conditions. A wafer of GaAs is masked and exposed to the vapor only through a long, narrow slot in the <110> direction. A thin ribbon of single crystal GaAs grows out of the slot at a high rate along the <112> vector and has {111} plane major faces and {110} plane edges. This ribbon is flexible. A H.sub.2 -AsCl.sub.3 -Ga epitaxy system is modified to permit retraction of the ribbon as it grows and thus the production of long ribbons.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: June 22, 1982
    Assignee: General Electric Company
    Inventor: Wirojana Tantraporn
  • Bandwidth compensated quarter-wave coupled power combiner
    Patent number: 4328471
    Abstract: A microwave power combiner/divider is matched internally and has increased bandwidth. A microwave integrated circuit disk within the housing has high impedance radially directed quarter-wavelength lines to obtain an impedance match for the desired mode at the centered coaxial port. Bridging half-wavelength lines between adjacent peripheral ports match the undesired mode and connect to absorbing resistors; these lines also provide bandwidth compensation. The housing has an annular shield with an opening near the centered coaxial line to provide a high choke impedance.
    Type: Grant
    Filed: September 15, 1980
    Date of Patent: May 4, 1982
    Assignee: General Electric Company
    Inventor: John P. Quine
  • Acoustic intensity monitor
    Patent number: 4323077
    Abstract: A system and method are disclosed for monitoring the acoustic intensity of ultrasonic energy applied to a body by an ultrasonic probe for the purpose of diagnosing an internal target. The probe contacts a limited area of the body skin and a coupling medium, such as a coupling gel, is interposed to enhance acoustic coupling between the probe and the skin. A thermally sensitive agent in the coupling medium imparts color to the latter indicative of the heat dissipated on the skin area under the probe. Whenever a predetermined color change of the coupling medium indicates that the heat dissipation on this area exceeds a predetermined limit, the acoustic intensity of the ultrasonic energy beamed to the target is reduced.
    Type: Grant
    Filed: March 12, 1980
    Date of Patent: April 6, 1982
    Assignee: General Electric Company
    Inventor: Lowell S. Smith
  • Tactile sensor
    Patent number: 4306148
    Abstract: A tactile area sensor for robots has an array of pneumatic flow passages. The air flow in each passage is dependent on a localized force exerted by an object pressing against an elastic pad on the face of the sensor. The air flow impinges on a metallic tab and its angular displacement is sensed by directing a light beam from an optical fiber onto the tab and monitoring the quantity of light reflected to a paired optical fiber. The array of optical outputs can be presented to a charge injection device and are dependent on the shape of the object.
    Type: Grant
    Filed: January 21, 1980
    Date of Patent: December 15, 1981
    Assignee: General Electric Company
    Inventors: Carl G. Ringwall, Allen W. Case, Jr.
  • Feed system for microwave oven
    Patent number: 4301347
    Abstract: The heating uniformity of a microwave oven is significantly improved by a feed that radiates rotating elliptically polarized electromagnetic waves. A pair of crossed slots in the feed rectangular waveguide has directional characteristics and radiates energy with right-hand and left-hand circular polarization. A variable phase shifter in the waveguide changes the phase of one of the polarizations. Both polarizations interfere in the oven cavity and produce rotating elliptically polarized waves. The circular polarizing element can be a 3-dB hybrid coupler or a turnstile junction.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: November 17, 1981
    Assignee: General Electric Company
    Inventor: John P. Quine
  • Planar microwave integrated circuit power combiner
    Patent number: 4291278
    Abstract: A broadband, low loss, microwave integrated circuit power combiner for field effect transistors and other solid state amplifiers has a single metallized MIC substrate contained within a waveguide structure. An array of fin-line transitions from plural microstrip lines to a standard output waveguide can be tapered and placed directly in the waveguide taper region. Undesired higher order modes are absorbed by resistance metallization strips at the tips of the fin-lines or by resistor networks which bridge the microstrip lines.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: September 22, 1981
    Assignee: General Electric Company
    Inventor: John P. Quine
  • Magnetic tape leads for probes in electromagnetic radiation
    Patent number: 4281287
    Abstract: Electrically conducting magnetic recording tape having a coating of .gamma.-Fe.sub.2 O.sub.3 particles on a polyester substrate is used as leads for probes in oven cavities and other microwave fields. The tape leads are flexible, have a high resistance per unit length, and are nearly transparent to electromagnetic waves. Electric diode-dipole probes with such leads are uniquely electric and a magnetic loop detector is uniquely magnetic.
    Type: Grant
    Filed: April 9, 1979
    Date of Patent: July 28, 1981
    Assignee: General Electric Company
    Inventors: Charles L. Andrews, Lorne H. Belden, Jr.
  • Adaptive input circuit
    Patent number: 4277978
    Abstract: An input circuit is disclosed for variably adapting the dynamic range of an ultrasonic frequency electrical signal to the dynamic range of a signal receiver to which the signal is applied. A band pass filter admits the appropriate band of signal frequencies to the receiver to provide optimum signal-to-noise conditions. A JFET device is shunted across the receiver input and its drain-to-source impedance is varied to control the peak voltage developed by the signal. Control of the impedance of the JFET device may be effected in a pre-programmed manner as a function of time, in response to the amplitude of the signal applied to the receiver input, or in response to both. In either case, the amplitude of the applied signal is constrained to remain substantially within the dynamic range of the receiver.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: July 14, 1981
    Assignee: General Electric Company
    Inventor: Charles M. Puckette
  • Transparent composite laminar structure, solar collector and method
    Patent number: 4273098
    Abstract: An improved transparent laminar structure useful as a window in a solar collector having an absorber characterized with a low absorption/emission ratio is described. The structure includes a glass substrate, a particularly defined infrared-reflecting (IRR) layer provided on a major surface of the substrate, and a solar reflection-reducing layer of polymethacrylate composition provided on the IRR layer. Also described are an improved solar collector and method for collecting solar radiation, wherein the laminar structure is employed.
    Type: Grant
    Filed: January 2, 1979
    Date of Patent: June 16, 1981
    Assignee: General Electric Company
    Inventor: Seth D. Silverstein
  • Measurement of true blood velocity by an ultrasound system
    Patent number: 4265126
    Abstract: Two components of the velocity of blood or similar liquids and the true flow vector are derived by a linear transducer array cross-beam configuration. Ultrasound pulses are transmitted from the center elements and backscattered echoes are received by left and right receiver sub-arrays whose locations depend on the observation point. A duplex imaging system with a sector scanner incorporates a Doppler modality with little added complexity and provides components of flow velocity parallel to and transverse to the acoustic beam direction from which the true velocity vector is computed.
    Type: Grant
    Filed: June 15, 1979
    Date of Patent: May 5, 1981
    Assignee: General Electric Company
    Inventors: Emmanuel Papadofrangakis, William E. Engeler, John A. Fakiris
  • Ultrasonic transducer fabricated as an integral park of a monolithic integrated circuit
    Patent number: 4262399
    Abstract: An array of electrostatic transducers is fabricated on a monolithic integrated circuit chip having provision for detection, amplification, and signal processing of received echoes. The transducer is multilayered with the form of a parallel plate capacitor, and is made by laterally etching an insulating layer through a small hole in the overlying layer to create a void region, then depositing a sealing layer to seal the etch holes. The upper metallic layers cover the transducer array and other monolithic circuitry and are etched to be interconnections for the various components.
    Type: Grant
    Filed: November 8, 1978
    Date of Patent: April 21, 1981
    Assignee: General Electric Co.
    Inventor: William R. Cady