Patents Examined by Robert M. Reese
  • Patent number: 4244693
    Abstract: A method and composition for detecting the presence of an alkali metal on the surface of a body such as a metal plate, tank, pipe or the like is provided. The method comprises contacting the surface with a thin film of a liquid composition comprising a light-colored pigment, an acid-base indicator, and a nonionic wetting agent dispersed in a liquid carrier comprising a minor amount of water and a major amount of an organic solvent selected from the group consisting of the lower aliphatic alcohols, ketones and ethers. Any alkali metal present on the surface in elemental form or as an alkali metal hydroxide or alkali metal carbonate will react with the acid-base indicator to produce a contrasting color change in the thin film, which is readily discernible by visual observation or automatic techniques.
    Type: Grant
    Filed: February 28, 1977
    Date of Patent: January 13, 1981
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: Jerold Guon
  • Patent number: 4157895
    Abstract: This application relates to thyroxine (T.sub.4) immunoassay procedures and, in particular, to the preparation of a novel filter-paper test substrate and a novel standard reagent used in preparation of the test substrate. The standard reagent used in preparation of the test substrate is prepared from commercially available materials and does not require the use of a human serum component.
    Type: Grant
    Filed: October 7, 1977
    Date of Patent: June 12, 1979
    Assignee: Nuclear International Corporation
    Inventors: Carole A. Finlay, Marvin Mitchell
  • Patent number: 4140487
    Abstract: A method for detecting the presence in water of substances which are rapidly oxidized by ozone with the emission of quanta of visible light, which method comprises contacting the water with ozone and detecting the light quanta emitted.
    Type: Grant
    Filed: December 6, 1976
    Date of Patent: February 20, 1979
    Assignee: Commonwealth Scientific and Industiral Research Organization
    Inventors: Victor A. Garten, Robert McNeill, Johannas M. Overbeek, Richard B. Head
  • Patent number: 4140489
    Abstract: A test tube having an inner tube that allows one to insert a bar to create a dark background is described. This system is actually an ordinary or screw-capped test tube with a smaller sized test tube inverted and fused to the bottom. The design permits a thin layer of any agar medium to solidify around the inside edge of the larger tube. The colonies developed in the agar can then be easily counted by creating a dark background by inserting a dark colored rod through the opening of the inner tube.Alternatively, a permanently dark-colored inner tube can be inverted and fused to the bottom of the outer tube. In this case, it is not necessary to insert a rod to create a dark background and the enumeration of microbial colonies is as easy as the method described above.
    Type: Grant
    Filed: February 7, 1977
    Date of Patent: February 20, 1979
    Inventor: Sun Y. Lee
  • Patent number: 4138216
    Abstract: A device for monitoring ethylene oxide sterilization processes comprising a wick means impregnated with an ethylene oxide responsive chemical compound, a pH sensitive dye and a quantifier mounted on a backing strip and sealed with a cover strip to form an envelope having one edge at which the wick means is exposed. The device is responsive to time, temperature and relative humidity as well as ethylene oxide concentration.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: February 6, 1979
    Assignee: Bio-Medical Sciences, Inc.
    Inventors: Raymond P. Larsson, Robert J. Witonsky
  • Patent number: 4138214
    Abstract: A simple, sensitive, reliable and safe method and device for detecting pregnancy. The test involves concentration in the presence of polyvinylpyrrolidone by ultrafiltration of a sample of urine or serum from a subject; followed by determining the presence of human chorionic gonadotropin or of its .beta.-subunit in the concentrated sample.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: February 6, 1979
    Assignee: American Home Products Corporation
    Inventor: Morris L. Givner
  • Patent number: 4137047
    Abstract: Chromic acid anodized aluminum is placed in an enclosed container and covered with an aqueous alkali metal hydroxide solution. The rate of formation of hydrogen gas generated by the chemical interaction of the aluminum and the hydroxide determines corrosion resistance of the anodic film.
    Type: Grant
    Filed: September 27, 1977
    Date of Patent: January 30, 1979
    Assignee: Boeing Commercial Airplane Company
    Inventor: Duk H. Kim
  • Patent number: 4135881
    Abstract: A method and apparatus for determining in a laboratory the thermal cracking behavior of hydrocarbon feedstocks which are to be used in industrial cracking furnaces. The apparatus used includes an evaporation assembly and a cracking furnace assembly. A sample of hydrocarbon feedstock is first vaporized, then thermally cracked, and the cracked products are then fed to gas chromatography analytical equipment for analysis.
    Type: Grant
    Filed: October 5, 1977
    Date of Patent: January 23, 1979
    Assignee: Stamicarbon, B.V.
    Inventors: Cornelis A. C. L. Bakx, Jacobus T. J. VAN Goolen, Jacobus Jansen, Hubertus G. Kuiper
  • Patent number: 4132528
    Abstract: An improved analytical element for the detection of a predetermined analyte in an aqueous liquid under highly alkaline conditions is disclosed. The element features a stable, alkaline-providing composition.Preferably, the analytical element is a multi-zone element. The element is particularly useful in total protein analysis and, when so used, an improved biuret reagent composition for use therein is also provided. Methods of using the aforementioned analytical and biuret reagent composition are also disclosed.
    Type: Grant
    Filed: January 3, 1978
    Date of Patent: January 2, 1979
    Assignee: Eastman Kodak Company
    Inventors: Jon N. Eikenberry, Karl J. Sanford, Richard C. Sutton
  • Patent number: 4132527
    Abstract: A diagnostic composition containing as a chromogen a diamino-biphenyl derivative in which at least one of the hydrogen atoms in the amino groups thereof is replaced by a lower alkyl group by reaction with an alkylating agent. The diagnosing instrument is prepared by impregnating a bibulous, porous support in a solution comprising the diagnostic composition and optionally a saccharide oxidase, peroxidase and a guaiac, and, if necessary, a buffer, a surfactant, a background adjusting dye and/or an agent for increasing the viscosity of the composition. This diagnosing instrument can be handled in a simple and convenient way and is used to identify semi-quantitatively a saccharide in body fluids or excrements of humans or animals with reliability.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: January 2, 1979
    Assignee: Shionogi & Co., Ltd.
    Inventors: Hideyuki Maekawa, Kaoru Ishitobi
  • Patent number: 4129418
    Abstract: A halogen detector is disclosed herein in which the active alkali metal compound is independently heated thereby permitting the sensor to discriminate between halogen compounds of different thermal stabilities. Certain lesser stable halogen compounds such as Freon 22 and chloroform can be distinguished from more stable halogen compounds such as Freon 12 when such halogen compounds are present in air.
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: December 12, 1978
    Assignee: General Electric Company
    Inventor: William D. Davis
  • Patent number: 4126418
    Abstract: Curvette of generally circular form having apertures adjacent the outer periphery and having a plurality of compartment elements formed of an optically-clear plastic snugly locked in the apertures.
    Type: Grant
    Filed: July 28, 1977
    Date of Patent: November 21, 1978
    Assignee: Elkay Products, Inc.
    Inventor: Leonard L. Krasnow
  • Patent number: 4125374
    Abstract: A wide range combustion mixture air/fuel ratio sensor in which an electrochemical cell supplies hydrogen gas to a palladium sensor element at a rate regulated by the output of a Wheatstone bridge circuit incorporating the sensor element. This generated hydrogen gas combines with any oxygen present in the exhaust gas through catalytic action and also maintains the level of absorbed hydrogen, and therefore the electrical resistance of the palladium sensor element, at a preselected value. The magnitude of the current applied to the electrochemical cell necessary to maintain this balance is a measure of the combustion mixture air/fuel ratio.
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: November 14, 1978
    Assignee: Bendix Autolite Corporation
    Inventors: James D. Bode, William G. Wolber, Paul A. Michaels, Charles J. Ahern
  • Patent number: 4125377
    Abstract: Disclosed is a technique for accelerating the Hantzsch reaction, for the clinical determination of triglyceride, so as to permit the reaction to be analytically complete within 15 minutes at 37.degree. C. As is known, in this Hantzsch reaction, one mole of aldehyde is reacted in a solution predominantly containing alcohol and water with two moles of a betadicarbonyl compound in the presence of ammonia to yield, as a colored derivative, a lutidine. In the disclosed technique, the solution also contains an organic accelerator compound. This compound is capable of forming a clear solution with the mixture of components of the reaction solution and is further characterized as having an aprotic internal dipole such that said compound has a distinct center which is electron rich and a center which is electron deficient.
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: November 14, 1978
    Assignee: Pierce Chemical Company
    Inventor: E. Melvin Gindler
  • Patent number: 4123225
    Abstract: The invention provides a combustible gas detector in which a heatable wire filament embedded in a pellet comprising oxidation catalyst material exhibits a change in resistance occasioned by the change in its temperature which occurs due to the oxidation of a combustible gas passing over it.The pellet is provided with an outer layer of inert non-catalytic material which tends to prevent non-volatile residues from reaching catalytically active regions of the detector.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: October 31, 1978
    Assignee: English Electric Valve Company Limited
    Inventors: Eric Jones, Rodney P. Townsend
  • Patent number: 4120659
    Abstract: Improved analysis of sulfur concentration in carbonaceous sample uses carbon dioxide produced by the sample as an internal monitor of sample density reflected in the derived sulfur concentration.
    Type: Grant
    Filed: July 7, 1977
    Date of Patent: October 17, 1978
    Assignee: Standard Oil Company (Indiana)
    Inventor: Wendell P. Cropper
  • Patent number: 4120660
    Abstract: Apparatus for the determination of the oxidative stability of polymers exhibiting viscous or visco-elastic flow at the temperature of the determination is disclosed. The apparatus comprises a mixing head having means to subject polymer to shear, means to measure the oxygen content of gas, means to circulate the gas from the mixing means to the analyzing means and back to the mixing head and pressure control means to control the pressure of the gas at atmospheric pressure without extraneous dilution. In a preferred embodiment the pressure control means includes an elongated tube having a ratio of length to diameter of at least 800. A method for determining the oxidative stability of polymer under shear conditions is also disclosed. The apparatus and process may be used for the determination of the oxidative stability of, for example, elastomeric and thermoplastic polymers under conditions resembling the conditions under which such polymers are fabricated into articles.
    Type: Grant
    Filed: November 9, 1977
    Date of Patent: October 17, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Joseph Donnelly Trizisky
  • Patent number: 4119404
    Abstract: A flame photometric detector for use with a gas chromatograph comprises a burner to produce a cool hydrogen flame and excite molecules of the gas sample to emit light characteristic thereof, a transparent chimney surrounding the burner and flame to enhance characteristic light emission, a selective light filtering means, and sensing means positioned so as to exclude the flame from its sensing area. The device and method of operation are characterized by a substantially broader range of detection and measurement than is possible with present commercially available equipment.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: October 10, 1978
    Assignee: Core Laboratories, Inc.
    Inventor: John G. W. Price
  • Patent number: 4119403
    Abstract: The invention pertains to "wet chemistry" analytical devices for pollutant gases in air. Numerous improvements are provided including a thermo-electric heating/cooling device which uses the atmosphere as a heat sump. Critical flow means to maintain constant pressure throughout the system is also provided.
    Type: Grant
    Filed: June 15, 1977
    Date of Patent: October 10, 1978
    Assignee: W. R. Grace & Co.
    Inventor: John Walter Rex
  • Patent number: 4119401
    Abstract: Reagent and reagent mixtures useful for detecting and measuring total bilirubin concentrations in biological liquids such as serum and methods of assaying biological liquids using such reagents are disclosed.
    Type: Grant
    Filed: June 7, 1977
    Date of Patent: October 10, 1978
    Assignee: Technicon Instruments Corporation
    Inventors: Musa M. Sansur, Daniel L. Vlastelica, Anne C. Delea