Patents Represented by Attorney Karla Ojanen
  • Patent number: 5272293
    Abstract: A rolamite acceleration sensor which has a failsafe feature including a housing, a pair of rollers, a tension band wrapped in an S shaped fashion around the rollers, wherein the band has a force-generation cut out and a failsafe cut out or weak portion. The failsafe cut out or weak portion breaks when the sensor is subjected to an excessive acceleration so that the sensor fails in an open circuit (non-conducting) state permanently.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: December 21, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Joseph P. Abbin, Clifton F. Briner, Samuel B. Martin
  • Patent number: 5262395
    Abstract: A transimpedance amplifier for use with high temperature superconducting, other superconducting, and conventional semiconductor allows for appropriate signal amplification and impedance matching to processing electronics. The amplifier incorporates the superconducting flux flow transistor into a differential amplifier configuration which allows for operation over a wide temperature range, and is characterized by high gain, relatively low noise, and response times less than 200 picoseconds over at least a 10-80 K. temperature range. The invention is particularly useful when a signal derived from either far-IR focal plane detectors or from Josephson junctions is to be processed by higher signal/higher impedance electronics, such as conventional semiconductor technology.
    Type: Grant
    Filed: March 12, 1992
    Date of Patent: November 16, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: David S. Ginley, Vincent M. Hietala, Jon S. Martens
  • Patent number: 5258990
    Abstract: A vertical-cavity surface-emitting laser is disclosed comprising a laser cavity sandwiched between two distributed Bragg reflectors. The laser cavity comprises a pair of spacer layers surrounding one or more active, optically emitting quantum-well layers having a bandgap in the visible which serve as the active optically emitting material of the device. The thickness of the laser cavity is m .lambda./2n.sub.eff where m is an integer, .lambda. is the free-space wavelength of the laser radiation and n.sub.eff is the effective index of refraction of the cavity. Electrical pumping of the laser is achieved by heavily doping the bottom mirror and substrate to one conductivity-type and heavily doping regions of the upper mirror with the opposite conductivity type to form a diode structure and applying a suitable voltage to the diode structure. Specific embodiments of the invention for generating red, green, and blue radiation are described.
    Type: Grant
    Filed: November 7, 1991
    Date of Patent: November 2, 1993
    Assignee: The United States of America as represented by the Secretary of the United States Department of Energy
    Inventors: Gregory R. Olbright, Jack L. Jewell
  • Patent number: 5237629
    Abstract: A digitally controlled distributed phase shifter is comprised of N phase shifters. Digital control is achieved by using N binary length-weighted electrodes located on the top surface of a waveguide. A control terminal is attached to each electrode thereby allowing the application of a control signal. The control signal is either one or two discrete bias voltages. The application of the discrete bias voltages changes the modal index of a portion of the waveguide that corresponds to a length of the electrode to which the bias voltage is applied, thereby causing the phase to change through the underlying portion of the waveguide. The digitally controlled distributed phase shift network has a total phase shift comprised of the sum of the individual phase shifters.
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: August 17, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Vincent M. Hietala, Stanley H. Kravitz, Gregory A. Vawter
  • Patent number: 5235248
    Abstract: A compact device called the split cavity modulator whose self-generated oscillating electromagnetic field converts a steady particle beam into a modulated particle beam. The particle beam experiences both signs of the oscillating electric field during the transit through the split cavity modulator. The modulated particle beam can then be used to generate microwaves at that frequency and through the use of extractors, high efficiency extraction of microwave power is enabled. The modulated beam and the microwave frequency can be varied by the placement of resistive wires at nodes of oscillation within the cavity. The short beam travel length through the cavity permit higher currents because both space charge and pinching limitations are reduced. The need for an applied magnetic field to control the beam has been eliminated.
    Type: Grant
    Filed: June 8, 1990
    Date of Patent: August 10, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: M. Collins Clark, P. Dale Coleman, Barry M. Marder
  • Patent number: 5225368
    Abstract: A method is described for patterning subsurface features in a semiconductor device, wherein the semiconductor device includes an internal strained layer. The method comprises creating a pattern of semiconductor material over the semiconductor device, the semiconductor material having a predetermined thickness which stabilizes areas of the strained semiconductor layer that lie beneath the pattern. Subsequently, a heating step is applied to the semiconductor device to cause a relaxation in areas of the strained layer which do not lie beneath the semiconductor material pattern, whereby dislocations result in the relaxed areas and impair electrical transport therethrough.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: July 6, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Brian W. Dodson
  • Patent number: 5226131
    Abstract: A sequencing and data fanout mechanism is provided for a dataflow processor is activated by an input token which causes a sequence of operations to occur by initiating a first instruction to act on data contained within the token and then executing a sequential thread of instructions identified by either a repeat count and an offset within the token, or by an offset within each preceding instruction.
    Type: Grant
    Filed: August 28, 1991
    Date of Patent: July 6, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Victor G. Grafe, James E. Hoch
  • Patent number: 5201215
    Abstract: A method, using a quartz crystal microbalance, to obtain simultaneous measurement of solid mass accumulation and changes in liquid density-viscosity product. The simultaneous real-time measurements of electrical parameters yields that changes in surface mass can be differentiated from changes in solution properties. Two methods to obtain the admittance/frequency data are employed.
    Type: Grant
    Filed: October 17, 1991
    Date of Patent: April 13, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Victoria E. Granstaff, Stephen J. Martin
  • Patent number: 5198716
    Abstract: A micro-machined resonator, typically quartz, with upper and lower micro-machinable support members, or covers, having etched wells which may be lined with conductive electrode material, between the support members is a quartz resonator having an energy trapping quartz mesa capacitively coupled to the electrode through a diaphragm; the quartz resonator is supported by either micro-machined cantilever springs or by thin layers extending over the surfaces of the support. If the diaphragm is rigid, clock applications are available, and if the diaphragm is resilient, then transducer applications can be achieved. Either the thin support layers or the conductive electrode material can be integral with the diaphragm. In any event, the covers are bonded to form a hermetic seal and the interior volume may be filled with a gas or may be evacuated. In addition, one or both of the covers may include oscillator and interface circuitry for the resonator.
    Type: Grant
    Filed: December 9, 1991
    Date of Patent: March 30, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Ned A. Godshall, Dale R. Koehler, Alan Y. Liang, Bradley K. Smith
  • Patent number: 5193909
    Abstract: The present invention is a quantitative method for measuring the total heat flux, and of deriving the total power dissipation, of a heat-fluxing object which includes the steps of placing an electrical noise-emitting heat-fluxing object in a liquid helium bath and measuring the superfluid transition temperature of the bath. The temperature of the liquid helium bath is thereafter reduced until some measurable parameter, such as the electrical noise, exhibited by the heat-fluxing object or a temperature-dependent resistive thin film in intimate contact with the heat-fluxing object, becomes greatly reduced. The temperature of the liquid helum bath is measured at this point. The difference between the superfluid transition temperature of the liquid helium bath surrounding the heat-fluxing object, and the temperature of the liquid helium bath when the electrical noise emitted by the heat-fluxing object becomes greatly reduced, is determined.
    Type: Grant
    Filed: May 12, 1992
    Date of Patent: March 16, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Robert V. Duncan
  • Patent number: 5177352
    Abstract: A monolithic optical tamper sensor, comprising an optical emitter and detector, connected by an optical waveguide and placed into the critical entry plane of an enclosed sensitive region, the tamper sensor having a myriad of scraps of a material optically absorbent at the wavelength of interest, such that when the absorbent material is in place on the waveguide, an unique optical signature can be recorded, but when entry is attempted into the enclosed sensitive region, the scraps of absorbent material will be displaced and the optical/electrical signature of the tamper sensor will change and that change can be recorded.
    Type: Grant
    Filed: June 6, 1991
    Date of Patent: January 5, 1993
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Richard F. Carson, Stephen A. Casalnuovo
  • Patent number: 5173595
    Abstract: A punchcode reader is provided for reading data encoded in a punchcode hole array on a dosimeter. The dosimeter falls through a passage in the reader containing photosensor detectors disposed along the passage which provide output signals to a microprocessor. The signals are processed to determine the orientation of the dosimeter in the reader, the location and state of punchcode holes in a two row array thereby decoding the encoded data. Multiple rate of fall calculations are made, and if appropriate matching of the punchcode array is not obtained in three tries, an error signal is outputted to the operator. The punchcode reader also provides for storage of data from multiple dosimeters passed through the reader, and for the output of decoded data to an external display or a computer for further processing.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: December 22, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: James M. Langsted
  • Patent number: 5171399
    Abstract: A method for on-line accurate monitoring and precise control of molecular beam epitaxial growth of Groups III-III-V or Groups III-V-V layers in an advanced semiconductor device incorporates reflection mass spectrometry. The reflection mass spectrometry is responsive to intentional perturbations in molecular fluxes incident on a substrate by accurately measuring the molecular fluxes reflected from the substrate.The reflected flux is extremely sensitive to the state of the growing surface and the measurements obtained enable control of newly forming surfaces that are dynamically changing as a result of growth.
    Type: Grant
    Filed: August 15, 1990
    Date of Patent: December 15, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas M. Brennan, B. Eugene Hammons, Jeffrey Y. Tsao
  • Patent number: 5171981
    Abstract: A fiber optic voltage sensor is described which includes a source of light, a reference fiber for receiving a known percentage of the light and an electrostrictive element having terminals across which is applied, a voltage to be measured. The electrostrictive element is responsive to the applied voltage to assume an altered physical state. A measuring fiber also receives a known percentage of light from the light source and is secured about the electrostrictive element. The measuring fiber is provided with a cladding and exhibits an evanescent wave in the cladding. The measuring fiber has a known length which is altered when the electrostrictive element assumes its altered physical state. A differential sensor is provided which senses the intensity of light in both the reference fiber and the measuring fiber and provides an output indicative of the difference between the intensities.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: December 15, 1992
    Assignee: The United States of America as represented by United States Department of Energy
    Inventor: Charles B. Wood
  • Patent number: 5167724
    Abstract: A planar photovoltaic concentrator module for producing an electrical signal from incident solar radiation includes an electrically insulating housing having a front wall, an opposing back wall and a hollow interior. A solar cell having electrical terminals is positioned within the interior of the housing. A planar conductor is connected with a terminal of the solar cell of the same polarity. A lens forming the front wall of the housing is operable to direct solar radiation incident to the lens into the interior of the housing. A refractive optical element in contact with the solar cell and facing the lens receives the solar radiation directed into the interior of the housing by the lens and directs the solar radiation to the solar cell to cause the solar cell to generate an electrical signal. An electrically conductive planar member is positioned in the housing to rest on the housing back wall in supporting relation with the solar cell terminal of opposite polarity.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: December 1, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Clement J. Chiang
  • Patent number: 5132248
    Abstract: In a process for deposition of material onto a substrate, for example, the deposition of metals or dielectrics onto a semiconductor laser, the material is deposited by providing a colloidal suspension of the material and directly writing the suspension onto the substrate surface by ink jet printing techniques. This procedure minimizes the handling requirements of the substrate during the deposition process and also minimizes the exchange of energy between the material to be deposited and the substrate at the interface. The deposited material is then resolved into a desired pattern, preferably by subjecting the deposit to a laser annealing step. The laser annealing step provides high resolution of the resultant pattern while minimizing the overall thermal load of the substrate and permitting precise control of interface chemistry and interdiffusion between the substrate and the deposit.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: July 21, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Timothy Drummond, David Ginley
  • Patent number: 5125321
    Abstract: An electromagnetic cylindrical projectile mass launcher and a method of operation is provided which includes a cylindrical projectile having a conducting armature, a cylindrical barrel in which the armature is received, a plurality of electromagnetic drive coil stages, a plurality of pulse energy sources, and a pulsed power arrangement for generating magnetic pulses forming a pulsed magnetic wave along the length of the launcher barrel. The pulsed magnetic wave provides a propelling force on the projectile along the drive coil. The pulsed magnetic wave of the drive coil stages is advanced along the armature faster than the projectile to thereby generate an induced current wave in the armature. The pulsed generation of the magnetic wave minimizes electromagnetic heating of the projectile and provides for smooth acceleration of the projectile through the barrel of the launcher.
    Type: Grant
    Filed: December 6, 1990
    Date of Patent: June 30, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Maynard Cowan, Jr., Billy W. Duggin, Melvin M. Widner
  • Patent number: 5117146
    Abstract: Solid-state acoustic sensors for monitoring conditions at a surface immersed in a liquid and for monitoring concentrations of species in a liquid and for monitoring electrical properties of a liquid are formed by placing interdigital input and output transducers on a piezoelectric substrate and propagating acoustic plate modes therebetween. The deposition or removal of material on or from, respectively, a thin film in contact with the surface, or changes in the mechanical properties of a thin film in contact with the surface, or changes in the electrical characteristics of the solution, create perturbations in the velocity and attenuation of the acoustic plate modes as a function of these properties or changes in them.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: May 26, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Stephen J. Martin, Antonio J. Ricco
  • Patent number: 5102825
    Abstract: Planar-buried-heterostructure, graded-index, separate-confinement-heterostructure semiconductor diode laser 10 includes a single quantum well or multi-quantum well active stripe 12 disposed between a p-type compositionally graded Group III-V cladding lever 14 and an n-type compositionally graded Group III-V cladding layer 16. The laser 10 includes an iion implanted n-type region 28 within the p-type cladding layer 14 and further includes an ion implanted p-type region 26 within the n-type cladding layer 16. The ion implanted regions are disposed for defining a lateral extent of the active stripe.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: April 7, 1992
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Thomas M. Brennan, Burrell E. Hammons, David R. Myers, Gregory A. Vawter
  • Patent number: 5076094
    Abstract: A method of identification and quantification of absorbed chemical species by measuring changes in both the velocity and the attenuation of an acoustic wave traveling through a thin film into which the chemical species is sorbed. The dual output response provides two independent sensor responses from a single sensing device thereby providing twice as much information as a single output sensor. This dual output technique and analysis allows a single sensor to provide both the concentration and the identity of a chemical species or permits the number of sensors required for mixtures to be reduced by a factor of two.
    Type: Grant
    Filed: October 3, 1990
    Date of Patent: December 31, 1991
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Gregory C. Frye, Stephen J. Martin