Patents Represented by Attorney William H. Pittman

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  • Method for making 2-fluoro-2-deoxyglucose
    Patent number: 5436325
    Abstract: A method is provided for preparing [.sup.18 F]2-fluoro-2-deoxyglucose with an anion exchange resin by effecting an exchange reaction between an aqueous solution of [.sup.18 F]fluoride containing an alkali metal carbonate or bicarbonate, such as sodium bicarbonate, and an anion, such as bicarbonate or carbonate, on the anion exchange resin followed by the displacement reaction with 1,3,4,6-tetra-O-acetyl-2-O-trifluoromethanesulfonyl-.beta.-D-mannopyranose to form the resulting 2-fluoro-2-deoxyglucose tetraacetate. Improved yields of the [.sup.18 F]2-fluoro-2-deoxyglucose are obtained when the alkali bicarbonate or carbonate is used in the target water.
    Type: Grant
    Filed: July 18, 1994
    Date of Patent: July 25, 1995
    Assignee: General Electric Company
    Inventors: Bruce F. Johnson, Maxim Y. Kiselev, Johan Ulin
  • Process for isolating macrocyclic polyester oligomers
    Patent number: 5434244
    Abstract: Process for isolating macrocyclic polyester oligomers from impurities comprising the step of subjecting solutions of macrocyclic polyester oligomers to protonated molecular sieves.
    Type: Grant
    Filed: December 9, 1994
    Date of Patent: July 18, 1995
    Assignee: General Electric Company
    Inventors: Gregory L. Warner, Paul R. Wilson, Jean E. Bradt
  • Method for adhering diamondlike carbon to a substrate
    Patent number: 5431963
    Abstract: The electrical field at the surface of an electrode is graded by depositing a semiconductive coating thereon. An electrode substrate is powered at a preselected temperature and power. A mixture of gases is then passed through an electrical discharge to ionize at least a portion thereof to form the semiconductive coating on the surface of the electrode. A diamondlike carbon (DLC) film is deposited by plasma enhanced chemical vapor deposition onto a substrate. A substrate is maintained at a preselected DLC forming temperature and is negatively biased at a first preselected voltage. A first gaseous mixture of hydrocarbons and argon is then passed through an electrical discharge to at least partially ionize the hydrocarbons to form DLC film on the substrate. The substrate is then negatively biased at a second preselected voltage lower than the first preselected voltage.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: July 11, 1995
    Assignee: General Electric Company
    Inventors: Stefan J. Rzad, Michael W. DeVre
  • Heat curable organopolysiloxane compositions, preformed latent platinum catalysts, and methods for making
    Patent number: 5432140
    Abstract: Heat curable organopolysiloxane compositions are provided utilizing a vinyl silicone organopolysiloxane fluid, a silicon hydride siloxane and an effective amount of a preformed latent platinum catalyst resulting from the reaction in the substantial absence of organopolysiloxane fluid, between a zero valent platinum catalyst and an organic nitrogen compound, such as 2,2'-bipyridine or diethyl azodicarboxylate.
    Type: Grant
    Filed: November 19, 1993
    Date of Patent: July 11, 1995
    Assignee: General Electric Company
    Inventors: Chris A. Sumpter, Larry N. Lewis, William B. Lawrence
  • Method for recovering phenol and xanthene values from bisphenol A tars
    Patent number: 5430199
    Abstract: A method is provided for recovering phenol values from bisphenol A tar by treating the bisphenol A tar with an alkyl phenol, such as cresol in the presence of an acid catalyst. In addition to recovering phenol, there is obtained a variety of dialkyl 9,9-dimethylxanthenes which can be converted to dicarboxylic acids and their corresponding diesters which are useful polymer intermediates.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: July 4, 1995
    Assignee: General Electric Company
    Inventors: Andrew J. Caruso, Julia L. Lee
  • Method for regenerating a sulfonated aromatic organic polymeric ion-exchange resin bed having deactivated aminoorganomercaptan groups with phenol
    Patent number: 5428075
    Abstract: A method is provided for regenerating deactivated sulfonated aromatic organic ion-exchange resin beds, such as a polystyrene ion-exchange resin bed, having chemically combined amino organo mercaptan groups with anhydrous phenol at an elevated temperature.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: June 27, 1995
    Assignee: General Electric Company
    Inventors: Eric J. Pressman, Sheldon J. Shafer
  • HF-CVD method for forming diamond
    Patent number: 5424096
    Abstract: Diamond is produced by chemical vapor deposition on a substrate by hot filament activation of a hydrogen-hydrocarbon gas mixture. An edge of the substrate faces the filament at a distance; therefrom up to about 1 mm. and preferably about 0.3-0.7 mm., and the substrate is moved relative to the filament to maintain this spacing as diamond forms thereon. Diamond formation proceeds at an improved rate, and in single crystal configuration under certain conditions.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: June 13, 1995
    Assignee: General Electric Company
    Inventors: Thomas R. Anthony, James F. Fleischer, Robert H. Ettinger
  • Suppression of graphite formation during laser etching of diamond
    Patent number: 5419798
    Abstract: Graphite formation on a diamond surface during laser etching is inhibited or the graphite is removed by contact with a gaseous material such as elemental hydrogen, elemental oxygen, an inert gas or a source of hydroxyl radicals. Preferably, the article being etched is cooled and maintained in an inert atmosphere during etching.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: May 30, 1995
    Assignee: General Electric Company
    Inventors: Thomas R. Anthony, James F. Fleischer
  • Apparatus for separating solids from fluids
    Patent number: 5417854
    Abstract: A novel apparatus for isolating solids or wetcakes from fluids is disclosed. Said apparatus is closed to the atmosphere and comprises a slip joint and a floating auger which allows for solid recovery under pressure in the absence of substantial solvent volatilization.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: May 23, 1995
    Assignee: General Electric Company
    Inventors: James Day, Ganesh Kailasam, Godavarthi S. Varadarajan, Kenneth M. Carroll
  • Addition-curable silicone adhesive compositions and bis (trialkoxysilyalkylene) urea adhesion promoters
    Patent number: 5416144
    Abstract: Addition-curable platinum group metal catalyzed silicone compositions are provided which utilize a bis[trialkyloxysilylalkylene]amine or urea adhesion promoter. Cohesive bonding can be effected on both plastic and metal substrates at temperatures of 100.degree. C. or below in less than 1 hour.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: May 16, 1995
    Assignee: General Electric Company
    Inventors: Judith Stein, Slawomir Rubinsztajn
  • Flame retardant polymer compositions comprising thermally stable resins
    Patent number: 5414046
    Abstract: Novel thermally stable resins comprising halogens and not epoxide termination groups are described. The thermally stable resins may be employed in polymer systems to yield flame retardant polymer compositions.
    Type: Grant
    Filed: June 17, 1994
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventor: Gary C. Davis
  • N-heterocyclic silane adhesion promoters
    Patent number: 5414066
    Abstract: Room temperature vulcanizable platinum group metal catalyzed silicone compositions are provided which utilize an N-heterocyclic adhesion promoter, such as 2,6 bis(trimethoxysilyltrimethyleneoxy)pyridine. Cohesive bonding is effected on various substrates.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventors: Judith Stein, Mark W. Davis
  • Method for adhering metal coatings to polyphenylene ether-polystyrene articles
    Patent number: 5413817
    Abstract: Substrates comprising blends of at least one polyphenylene ether and at least one poly(alkenylaromatic compound) (e.g., polystyrene) are treated with aqueous tetravalent cerium in a concentration of at least about 0.1 M, preferably acidified with nitric acid, to improve adhesion to metal coatings subsequently deposited nonelectrolytically; for example, by electroless deposition. The metallized articles are heat treated following metal deposition. Further metal coatings may be deposited, preferably followed by further heat treatment.
    Type: Grant
    Filed: November 5, 1993
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventors: Herbert S. Chao, Carol L. Fasoldt
  • Bisphosphine oxide monomers
    Patent number: 5414134
    Abstract: Bisphosphine oxide monomers and homologs thereof may be incorporated into polycarbonates in order to obtain a flame retardant polymer. More particularly, bis[2,5-(diphenylphosphine oxide)]-1,4-hydroquinone and homologs thereof may be used to prepare flame retardant polycarbonates that retain high glass transition temperature and high impact resistances.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventor: Gary C. Davis
  • Insulating foam of low thermal conductivity and method of preparation
    Patent number: 5413848
    Abstract: Low thermal conductivity insulation for refrigerators and the like is produced by blowing a resinous foam in an inert (e.g., nitrogen) atmosphere with a mixture of carbon dioxide and a low thermal conductivity inert gas such as krypton or xenon. The foam is then sealed in a gas-impervious enclosure and carbon dioxide is removed therefrom, typically by inclusion in said enclosure of a solid material reacted therewith such as an alkaline reagent. The final partial pressure of the low thermal conductivity gas in the enclosure is in the range of about 20-200 torr, and the total pressure is up to 110% of said partial pressure.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventors: Heinz Jaster, William J. Ward, III
  • Method for salvaging aromatic polycarbonate blend values
    Patent number: 5414021
    Abstract: A method is provided for effecting the removal of cured polyurethane paint from the surface of aromatic polycarbonate blend surfaces. Effective removal of thermally cured polyurethane paint from aromatic polycarbonate blend surface can be achieved by immersing the painted aromatic polycarbonate blend in an aqueous bath containing organic solvent, an alkali metal hydroxide and a surfactant.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventor: Victoria J. Eddy
  • Redistribution of organic polycarbonate compositions
    Patent number: 5414057
    Abstract: A process for the redistribution of an organic polycarbonate composition. The process involves melt equilibrating a starting polycarbonate composition (which may be a single polycarbonate or a mixture of polycarbonates, and may be or include recycled polycarbonate) having an initial weight average molecular weight in the presence of a carbonate redistribution catalyst and in the absence of branching agents, under conditions such that a redistributed polycarbonate composition is formed having a weight average molecular weight different from, and typically lower than, the initial weight.
    Type: Grant
    Filed: December 1, 1993
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventors: Allen J. Campbell, David M. Dardaris, Gary R. Faler, Patrick J. McCloskey, Thomas L. Evans
  • Method for making bisphenol
    Patent number: 5414151
    Abstract: A method is provided for making bisphenol by condensing a ketone and a phenol in the presence of a sulfonated aromatic organic polymeric ion-exchange catalyst having aminoorganomercaptan groups using a phenol having less than 1 ppm of hydroxyacetone.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: May 9, 1995
    Assignee: General Electric Company
    Inventors: Eric J. Pressman, Sheldon J. Shafer
  • Polycarbonate melt condensation synthesis using a tetraorganophosphonium carboxylate salt catalyst
    Patent number: 5412061
    Abstract: The present invention is directed to a method of making polycarbonates by the melt condensation of diarylcarbonate and dihydric phenol in the presence of a tetraorganophosphonium carboxylate salt, such as tetrabutylphosphonium acetate.
    Type: Grant
    Filed: March 7, 1994
    Date of Patent: May 2, 1995
    Assignee: General Electric Company
    Inventors: Joseph A. King, Jr., Patrick J. McCloskey
  • Heat curable primerless silicone hardcoat compositions
    Patent number: 5411807
    Abstract: Heat curable primerless silicone compositions are provided comprising an aqueous/organic solvent silicone dispersion in combination with an adhesion promoter, such as acrylate or methacrylate ester, for example, a caprolactone acrylate or methacrylate adhesion promoter. Composites of a thermoplastic substrate, such as a polycarbonate, and the thermally cured primerless silicone compositions are also provided.
    Type: Grant
    Filed: May 9, 1994
    Date of Patent: May 2, 1995
    Assignee: General Electric Company
    Inventors: Gautam A. Patel, Steven J. Kubisen