Patents Represented by Attorney Richard A. Kretchmer

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  • Simultaneous generation of laser radiation at two different frequencies
    Patent number: 4956843
    Abstract: The output of a single semiconductor light source is used to optically pump two solid state lasers which are arranged in series and produce laser radiation at two different frequencies. Single longitudinal and single transverse mode operation can be achieved in both lasers.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: September 11, 1990
    Assignee: Amoco Corporation
    Inventors: Pedram Akhavan-Leilabady, Douglas W. Anthon
  • Frequency conversion of optical radiation
    Patent number: 4933947
    Abstract: An intracavity frequency-modified laser of improved amplitude stability is obtained by substantially eliminating spatial hole burning in the lasant material and maintaining the optical cavity of the laser at a temperature which results in substantially noise-free generation of output radiation.
    Type: Grant
    Filed: May 18, 1989
    Date of Patent: June 12, 1990
    Assignee: Amoco Corporation
    Inventors: Douglas W. Anthon, Donald L. Sipes, Jr.
  • Method for increasing the output power of a laser diode
    Patent number: 4924471
    Abstract: The optical output power from a GaInP based laser diode can be at least doubled by slight cooling of the device with thermoelectric cooling means when the diode is operated in a substantially room temperature environment.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: May 8, 1990
    Assignee: Amoco Corporation
    Inventors: John H. Clark, James H. Fisher, Thomas Wolfram
  • Lithium-sulfur dioxide electrochemical cell with an iodine-catalyzed cathode
    Patent number: 4889779
    Abstract: The incorporation of both iodide ion and iodine into the electrolyte of a lithium-sulfur dioxide electrochemical cell improves the cathode discharge capacity of the cell.
    Type: Grant
    Filed: April 30, 1986
    Date of Patent: December 26, 1989
    Assignee: Amoco Corporation
    Inventors: John F. Connolly, Robert J. Thrash
  • Frequency conversion of optical radiation
    Patent number: 4884277
    Abstract: An intracavity frequency-modified laser of improved amplitude stability is obtained through the use of a plurality of nonlinear optical crystals within the laser cavity. Extremely low noise operation of such a multiple crystal laser is achieved by measuring the noise in its output radiation as a function of the temperature of its optical cavity and maintaining the cavity temperature at a value that results in low noise production during subsequent operation.
    Type: Grant
    Filed: June 16, 1988
    Date of Patent: November 28, 1989
    Assignee: Amoco Corporation
    Inventors: Douglas A. Anthon, Donald L. Sipes, Jr.
  • Optical feedback control in the frequency conversion of laser diode radiation
    Patent number: 4884276
    Abstract: Optical radiation from a laser diode is frequency modified through interaction with a nonlinear optical material in an external optical cavity. High efficiency frequency modification is achieved through the use of optical feedback from the external cavity to narrow the linewidth of the laser diode output and frequency lock the laser diode to the external cavity.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: November 28, 1989
    Assignee: Amoco Corporation
    Inventors: George J. Dixon, Douglas W. Anthon, John H. Clark
  • Generation of coherent optical radiation by optical mixing
    Patent number: 4879722
    Abstract: An efficient, compact source of coherent radiation in the infrared, visible and ultraviolet portion of the spectrum which is capable of modulation rates over the range from O Hz to in excess of 1 GHz. The radiation is produced by optical mixing within an external optical cavity wherein at least one of the interacting beams of light is provided by a solid state device selected from the group consisting of laser diodes, laser diode arrays and diode-pumped solid state lasers.
    Type: Grant
    Filed: November 25, 1987
    Date of Patent: November 7, 1989
    Assignee: Amoco Corporation
    Inventors: George J. Dixon, Douglas W. Anthon, John H. Clark
  • Intracavity generation of coherent optical radiation of optical mixing
    Patent number: 4879723
    Abstract: An efficient, compact source of coherent radiation in the infrared, visible and ultraviolet portion of the spectrum which is capable of modulation rates over the range from 0 Hz to in excess of 1 GHz. The radiation is produced by optical mixing within the optical cavity of a laser by introducing input radiation into the optical cavity where: (a) the cavity is that of a diode-pumped solid state laser, and/or (b) input radiation is provided by a solid state device selected from the group consisting of laser diodes, laser diode arrays and diode-pumped solid state lasers.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: November 7, 1989
    Assignee: Amoco Corporation
    Inventors: George J. Dixon, Douglas W. Anthon, John H. Clark
  • Electrolyte additive for lithium-sulfur dioxide electrochemical cell
    Patent number: 4869977
    Abstract: The degradation of organic electrode separators in rechargeable lithium-sulfur dioxide electrochemical cells which utilize chemically uncombined aluminum chloride as an electrolyte component can be reduced by incorporating an additive into the electrolyte which is effective to provide a redox couple having a potential in the range which is above that of the SO.sub.2 /S.sub.2 O.sub.4.sup.-2 couple and below that of the Cl.sub.2 /Cl.sup.- couple.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: September 26, 1989
    Assignee: Amoco Corporation
    Inventors: John F. Connolly, Robert J. Thrash, Bruce D. Webber
  • Ultraviolet laser treating of molded surfaces
    Patent number: 4803021
    Abstract: Ultraviolet laser treatment of molded articles effectively removes surface coatings, such as layers of mold-release agents, in a one-step dry process. Subsequent processing, as by bonding or painting, provides improved and superior quality molded articles in an economic manner.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: February 7, 1989
    Assignee: Amoco Corporation
    Inventors: Dennis L. Werth, Virupaksha K. Reddy
  • Laser having a substantially planar waveguide
    Patent number: 4791648
    Abstract: A laser which contains a substantially planar waveguide wherein the waveguide along the direction of light propagation is comprised of varying combinations of high-gain and low-gain regions so that the cumulative gain from one end of the optical cavity to the other varies as a function of position along a line within the plane of said waveguide which is perpendicular to the direction of light propagation.
    Type: Grant
    Filed: February 4, 1987
    Date of Patent: December 13, 1988
    Assignee: Amoco Corporation
    Inventors: Bruce A. Vojak, Sang K. Sheem
  • Porous lithium electrodes and their use in nonaqueous electrochemical cells
    Patent number: 4780380
    Abstract: Porous lithium electrodes for use in nonaqueous electrochemical cells are prepared by depositing lithium from solution in liquid ammonia.
    Type: Grant
    Filed: June 7, 1984
    Date of Patent: October 25, 1988
    Assignee: Standard Oil Company (Indiana)
    Inventor: Keith B. Prater
  • Optical analysis of impurity absorptions
    Patent number: 4755048
    Abstract: Optical apparatus and methods are employed in the determination of impurity components present in both homogenous and non-homogenous light-scattering products. Light sources having wavelengths in the visible and near-infrared regions are preferred.
    Type: Grant
    Filed: October 23, 1986
    Date of Patent: July 5, 1988
    Assignee: Amoco Corporation
    Inventor: R. Gilbert Kaufman
  • Electrolyte for lithium-sulfur dioxide electrochemical cell
    Patent number: 4752541
    Abstract: Aluminum chloride can be used as an electrolyte component in a lithium-sulfur dioxide electrochemical cell to improve the cell's discharge capacity and also its electrochemical reversibility.
    Type: Grant
    Filed: March 9, 1987
    Date of Patent: June 21, 1988
    Assignee: Amoco Corporation
    Inventors: Larry R. Faulkner, Isobel J. Davidson
  • Boron compounds to inhibit formation of tar during the "ene" reaction of an ethylenically unsaturated alpha, beta dicarboxylic acid compound and an ethylenically unsaturated hydrocarbon
    Patent number: 4736044
    Abstract: A process for the production of a substituted alpha, beta dicarboxylic acid compound substantially free of tar and other resinous reaction byproducts comprising the reaction at conditions favoring the ENE reaction of an ethylenically unsaturated hydrocarbon and an ethylenically unsaturated alpha, beta dicarboxylic acid compound in the presence of a boron compound.
    Type: Grant
    Filed: November 14, 1983
    Date of Patent: April 5, 1988
    Assignee: Amoco Corporation
    Inventor: Joseph B. Hanson
  • Solid state laser
    Patent number: 4731795
    Abstract: An optically pumped solid state laser which is constructed of components held in association by a support structure which is configured to receive the components and automatically arrange them with respect to one another along an optical path.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: March 15, 1988
    Assignee: Amoco Corporation
    Inventors: John H. Clark, Dennis L. Werth
  • Method for selective intermixing of layered structures composed of thin solid films
    Patent number: 4731338
    Abstract: A multilayer structure formed of two or more separate layers of different materials can be selectively intermixed so as to become compositionally transmuted, such that the distinction between the different original materials is lost, at least partially. This intermixing is accomplished by employing irradiation with a pulsed or rapidly scanned laser or electron beam. In addition,the intermixing can be accomplised by multiple pulses from the laser or electron beam so as to increase the degree of intermixing, thereby obtaining a more complete mixing.
    Type: Grant
    Filed: October 9, 1986
    Date of Patent: March 15, 1988
    Assignee: Amoco Corporation
    Inventors: John D. Ralston, Anthony L. Moretti, Ravinder K. Jain
  • Solid state laser and method of making
    Patent number: 4730335
    Abstract: An optically pumped solid state laser which is constructed of components having attached fittings which are structured in such a manner that the components are automatically arranged with respect to one another along an optical path upon joining the fittings together.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: March 8, 1988
    Assignee: Amoco Corporation
    Inventors: John H. Clark, Dennis L. Werth
  • Electrodeposition of lithium
    Patent number: 4713151
    Abstract: Ricinoleic acid triglycerides can be used to reduce dendrite formation during the electrodeposition of lithium from a nonaqueous solution which comprises at least one lithium salt and sulfur dioxide.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: December 15, 1987
    Assignee: Amoco Corporation
    Inventor: David J. Smith
  • Laser
    Patent number: D312445
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: November 27, 1990
    Assignee: Amoco Corporation
    Inventor: Robert A. Crosby