Patents Represented by Attorney James H. Chafin
  • Patent number: 5989748
    Abstract: The power loss of lithium/lithium ion battery cells is significantly reduced, especially at low temperatures, when about 1% by weight of an additive is incorporated in the electrolyte layer of the cells. The usable additives are organic solvent soluble cyanoethylated polysaccharides and poly(vinyl alcohol). The power loss decrease results primarily from the decrease in the charge transfer resistance at the interface between the electrolyte and the cathode.
    Type: Grant
    Filed: May 8, 1998
    Date of Patent: November 23, 1999
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Ganesan Nagasubramanian
  • Patent number: 5949219
    Abstract: A method and apparatus for determining the instantaneous state-of-charge of a battery in which change in composition with discharge manifests itself as a change in optical absorption. In a lead-acid battery, the sensor comprises a fiber optic system with an absorption cell or, alternatively, an optical fiber woven into an absorbed-glass-mat battery. In a lithium-ion battery, the sensor comprises fiber optics for introducing light into the anode to monitor absorption when lithium ions are introduced.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: September 7, 1999
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Jonathan D. Weiss
  • Patent number: 5836150
    Abstract: A micro thrust and heat generator has a means for providing a combustion fuel source to an ignition chamber of the micro thrust and heat generator. The fuel is ignited by a ignition means within the micro thrust and heat generator's ignition chamber where it burns and creates a pressure. A nozzle formed from the combustion chamber extends outward from the combustion chamber and tappers down to a narrow diameter and then opens into a wider diameter where the nozzle then terminates outside of said combustion chamber. The pressure created within the combustion chamber accelerates as it leaves the chamber through the nozzle resulting in pressure and heat escaping from the nozzle to the atmosphere outside the micro thrust and heat generator. The micro thrust and heat generator can be microfabricated from a variety of materials, e.g., of polysilicon, on one wafer using surface micromachining batch fabrication techniques or high aspect ratio micromachining techniques (LIGA).
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: November 17, 1998
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Ernest J. Garcia
  • Patent number: 5753930
    Abstract: A negative film reader records high-resolution optical density changes across negative film radiographic images to allow precise image dimensions to be determined. A laser light source capable of high-resolution focusing is passed through an intensity control filter, focused by a lens, and reflected off a mirror to focus in the plane of the negative film. The light transmitted through the film is collected by a second lens and directed to a photo diode detector which senses the transmitted intensity. The output of the photo diode signal amplifier is sent to the Y-axis input of an X-Y recorder. The film sample is transported in a plane perpendicular to the beam axis by means of a slide. The film position is monitored, with the signal amplified and recorded as the X-axis on the X-Y recorder. The linear dimensions and positions of image components can be determined by direct measurement of the amplified recording.
    Type: Grant
    Filed: May 17, 1996
    Date of Patent: May 19, 1998
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: G. Wayne Dutton
  • Patent number: 5742209
    Abstract: A four cavity, efficient magnetically insulated line oscillator (C4-E MILO) having seven vanes and six cavities formed within a tube-like structure surrounding a cathode. The C4-E MILO has a primary slow wave structure which is comprised of four vanes and the four cavities located near a microwave exit end of the tube-like structure. The primary slow wave structure is the four cavity (C4) portion of the magnetically insulated line oscillator (MILO). An RF choke is provided which is comprised of three of the vanes and two of the cavities. The RF choke is located near a pulsed power source portion of the tube-like structure surrounding the cathode. The RF choke increases feedback in the primary slow wave structure, prevents microwaves generated in the primary slow wave structure from propagating towards the pulsed power source and modifies downstream electron current so as to enhance microwave power generation.
    Type: Grant
    Filed: July 10, 1996
    Date of Patent: April 21, 1998
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Raymond W. Lemke, Miles C. Clark, Steve E. Calico
  • Patent number: 5729424
    Abstract: A solid electrolytic capacitor having a solid electrolyte comprising manganese dioxide dispersed in an aromatic polyamide capable of further cure to form polyimide linkages, the solid electrolyte being disposed between a first electrode made of valve metal covered by an anodic oxide film and a second electrode opposite the first electrode. The electrolyte autogenously produces water, oxygen, and hydroxyl groups which act as healing substances and is not itself produced pyrolytically. Reduction of the manganese dioxide and the water molecules released by formation of imide linkages result in substantially improved self-healing of anodic dielectric layer defects.
    Type: Grant
    Filed: September 27, 1995
    Date of Patent: March 17, 1998
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Donald J. Sharp, Pamela S. Armstrong, Janda Kirk G. Panitz
  • Patent number: 5675606
    Abstract: An ion source which generates hydrogen ions having high atomic purity incorporates a solenoidal permanent magnets to increase the electron path length. In a sealed envelope, electrons emitted from a cathode traverse the magnetic field lines of a solenoid and a monocusp magnet between the cathode and a reflector at the monocusp. As electrons collide with gas, the molecular gas forms a plasma. An anode grazes the outer boundary of the plasma. Molecular ions and high energy electrons remain substantially on the cathode side of the cusp, but as the ions and electrons are scattered to the aperture side of the cusp, additional collisions create atomic ions. The increased electron path length allows for smaller diameters and lower operating pressures.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: October 7, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: John Paul Brainard, Erskine John Thomas Burns, Charles Hadley Draper
  • Patent number: 5664040
    Abstract: There is provided an assembly having a light guiding medium sealed to a her. Preferably the holder is a metal shell and a light guiding medium is an optical fiber of glass or sapphire whisker. The assembly includes a sealing medium which sealingly engages the metal holder to the fiber. In the formation of the assembly, the seal is essentially hermetic having a capability of minimizing leakage having a helium leak rate of less than 1.times.10.sup.-8 cubic centimeters per second and high strength having a capability of withstanding pressures of 100,000 psi or greater. The features of the assembly are obtained by a specific preparation method and by selection of specific starting materials. The fiber is selected to have a sufficiently high coefficient of thermal expansion which minimizes strains in the component during fabrication, as a result of fabrication, and during use.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: September 2, 1997
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Daniel P. Kramer, Thomas M. Beckman
  • Patent number: 5652190
    Abstract: Magnetic polymer resins capable of efficient removal of actinides and heavy metals from contaminated water are disclosed together with methods for making, using, and regenerating them. The resins comprise polyamine-epichlorohydrin resin beads with ferrites attached to the surfaces of the beads. Markedly improved water decontamination is demonstrated using these magnetic polymer resins of the invention in the presence of a magnetic field, as compared with water decontamination methods employing ordinary ion exchange resins or ferrites taken separately.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: July 29, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Robert L. Kochen, James D. Navratil
  • Patent number: 5633626
    Abstract: A self-testing device is provided for a monitoring system for monitoring whether a closure member such as a door or window is closed. The monitoring system includes a switch unit mounted on the frame of the closure member being monitored and including magnetically biased switches connected in one or more electrical monitoring circuits, and a door magnet unit mounted on the closure member being monitored. The door magnet includes one or more permanent magnets that produce a magnetic field which, when the closure member is closed, cause said switches to assume a first state. When the closure member is opened, the switches switch to a second, alarm state. The self-testing device is electrically controllable from a remote location and produces a canceling or diverting magnetic field which simulates the effect of movement of the closure member from the closed position thereof without any actual movement of the member.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: May 27, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Duane C. Cawthorne
  • Patent number: 5631514
    Abstract: A microengine uses two synchronized linear actuators as a power source and converts oscillatory motion from the actuators into rotational motion via direct linkage connection to an output gear or wheel. The microengine provides output in the form of a continuously rotating output gear that is capable of delivering drive torque to a micromechanism. The microengine can be operated at varying speeds and its motion can be reversed. Linear actuators are synchronized in order to provide linear oscillatory motion to the linkage means in the X and Y directions according to a desired position, rotational direction and speed of said mechanical output means. The output gear has gear teeth on its outer perimeter for directly contacting a micromechanism requiring mechanical power. The gear is retained by a retaining means which allows said gear to rotate freely. The microengine is microfabricated of polysilicon on one wafer using surface micromachining batch fabrication.
    Type: Grant
    Filed: June 9, 1994
    Date of Patent: May 20, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Ernest J. Garcia, Jeffry J. Sniegowski
  • Patent number: 5622453
    Abstract: A method and apparatus (10) for forming improved seals in boreholes (101) formed in host rock (100) by using the apparatus (10) to introduce a feedstock (60) into the borehole (101) and simultaneously subject the introduced feedstock to both compressive and shear stresses until the borehole becomes filled and sealed.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: April 22, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Ray E. Finley, David H. Zeuch
  • Patent number: 5608520
    Abstract: Disclosed are a method and apparatus for performing photon diagnostics using a portable and durable apparatus which incorporates the use of a remote sensing probe in fiberoptic communication with an interferometer or spectrometer. Also disclosed are applications for the apparatus including optically measuring high velocities and analyzing plasma/emission spectral characteristics.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: March 4, 1997
    Assignee: The United States of America as represented by he Department of Energy
    Inventor: Kevin J. Fleming
  • Patent number: 5608404
    Abstract: A linear-FM SAR imaging radar method and apparatus to produce a real-time image by first arranging the returned signals into a plurality of subaperture arrays, the columns of each subaperture array having samples of dechirped baseband pulses, and further including a processing of each subaperture array to obtain coarse-resolution in azimuth, then fine-resolution in range, and lastly, to combine the processed subapertures to obtain the final fine-resolution in azimuth. Greater efficiency is achieved because both the transmitted signal and a local oscillator signal mixed with the returned signal can be varied on a pulse-to-pulse basis as a function of radar motion. Moreover, a novel circuit can adjust the sampling location and the A/D sample rate of the combined dechirped baseband signal which greatly reduces processing time and hardware.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: March 4, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Bryan L. Burns, J. Thomas Cordaro
  • Patent number: 5595666
    Abstract: Magnetic polymer resins capable of efficient removal of actinides and heavy metals from contaminated water are disclosed together with methods for making, using, and regenerating them. The resins comprise polyamine-epichlorohydrin resin beads with ferrites attached to the surfaces of the beads. Markedly improved water decontamination is demonstrated using these magnetic polymer resins of the invention in the presence of a magnetic field, as compared with water decontamination methods employing ordinary ion exchange resins or ferrites taken separately.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: January 21, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Robert L. Kochen, James D. Navratil
  • Patent number: 5594240
    Abstract: A voltage monitor which uses the shift in absorption edge of crystalline material to measure strain resulting from electric field-induced deformation of piezoelectric or electrostrictive material, providing a simple and accurate means for measuring voltage applied either by direct contact with the crystalline material or by subjecting the material to an electric field.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: January 14, 1997
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Jonathan D. Weiss
  • Patent number: 5583736
    Abstract: An electrostatic chuck is faced with a patterned silicon plate 11, created y micromachining a silicon wafer, which is attached to a metallic base plate 13. Direct electrical contact between the chuck face 15 (patterned silicon plate's surface) and the silicon wafer 17 it is intended to hold is prevented by a pattern of flat-topped silicon dioxide islands 19 that protrude less than 5 micrometers from the otherwise flat surface of the chuck face 15. The islands 19 may be formed in any shape. Islands may be about 10 micrometers in diameter or width and spaced about 100 micrometers apart. One or more concentric rings formed around the periphery of the area between the chuck face 15 and wafer 17 contain a low-pressure helium thermal-contact gas used to assist heat removal during plasma etching of a silicon wafer held by the chuck.
    Type: Grant
    Filed: November 17, 1994
    Date of Patent: December 10, 1996
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Robert A. Anderson, Carleton H. Seager
  • Patent number: 5582844
    Abstract: Molds for use in making end moldings for high-voltage cables are described wherein the dielectric insulator of a cable is heated and molded to conform to a desired shape. As a consequence, high quality substantially bubble-free cable connectors suitable for mating to premanufactured fittings are made.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: December 10, 1996
    Assignee: The United States of America as represented by The United States Department of Energy
    Inventor: Lars D. Roose
  • Patent number: 5573565
    Abstract: In the fabrication of igniters, actuators, detonators, and other pyrotechnic devices to be activated by a laser beam, an integral optical glass window is formed by placing a preform in the structural member of the device and then melting the glass and sealing it in place by heating at a temperature between the ceramming temperature of the glass and the melting point of the metal, followed by rapid furnace cooling to avoid devitrification. No other sealing material is needed to achieve hermeticity. A preferred embodiment of this type of device is fabricated by allowing the molten glass to flow further and form a plano-convex lens integral with and at the bottom of the window. The lens functions to decrease the beam divergence caused by refraction of the laser light passing through the window when the device is fired by means of a laser beam.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: November 12, 1996
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Rick D. Dalton, Daniel P. Kramer, Richard T. Massey, Damon A. Waker
  • Patent number: 5568585
    Abstract: A method for manufacturing low-temperature hermetically sealed optical fi components is provided. The method comprises the steps of: inserting an optical fiber into a housing, the optical fiber having a glass core, a glass cladding and a protective buffer layer disposed around the core and cladding; heating the housing to a predetermined temperature, the predetermined temperature being below a melting point for the protective buffer layer and above a melting point of a solder; placing the solder in communication with the heated housing to allow the solder to form an eutectic and thereby fill a gap between the interior of the housing and the optical fiber; and cooling the housing to allow the solder to form a hermetic compression seal between the housing and the optical fiber.
    Type: Grant
    Filed: March 13, 1995
    Date of Patent: October 22, 1996
    Assignee: The United States of America as represented by the Department of Energy
    Inventor: Daniel P. Kramer