Patents Represented by Attorney William H. Pittman

Find this attorney in the Justia Lawyer Directory

  • Process for producing cross-linked monodispersed polymeric particles
    Patent number: 5412048
    Abstract: Spherical monodispersed polymeric particles are prepared from vinyl monomers and crosslinking polymerizable polyvinyl monomers. More particularly, a novel process for producing spherical monodispersed gel particles that are about 1-6 .mu.m in size and contain at least about 0.5 to about 3 weight percent (based on polymerizable vinyl monomer/vinyl polymer) of a polymerizable polyvinyl monomer is disclosed. The process comprises the steps of combining an isoalkanol solvent, a polymerizable vinyl monomer and a crosslinking polymerizable polyvinyl monomer under timed and monitored conditions.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: May 2, 1995
    Assignee: General Electric Company
    Inventors: Kathryn L. Longley, John C. Schmidhauser
  • Primed, abrasion resistant thermoplastic articles and method for their preparation
    Patent number: 5409778
    Abstract: Improved adhesion of abrasion-resistant top coats such as silicone hardcoats to thermoplastic (preferably polycarbonate) surfaces is obtained by employing as a primer a mixture of poly(methyl methacrylate) with a copolymer of methyl methacrylate and at least one other alkyl acrylate, said copolymer having a glass transition temperature up to about 75.degree. C. The improvement in adhesion is particularly noticeable for dip-coated and flow-coated substrates having top coats of variable thickness.
    Type: Grant
    Filed: February 22, 1994
    Date of Patent: April 25, 1995
    Assignee: General Electric Company
    Inventor: Gautam A. Patel
  • Particulated platinum group metal containing silicone resin catalyst, method for making, and use
    Patent number: 5410007
    Abstract: The present invention is directed to solvent free particulated platinum group metal silicone resin catalyst resulting from the spray drying of an organic solvent mixture of a platinum group metal complex, and an alkenyl containing organosiloxane resin. Heat curable organopolysiloxane compositions containing such particulated platinum group metal silicone resin catalyst are also provided.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: April 25, 1995
    Assignee: General Electric Company
    Inventors: Larry N. Lewis, Jeffrey H. Wengrovius, Timothy B. Burnell, Jonathan D. Rich
  • Process for preparing macrocyclic polyester oligomers
    Patent number: 5407984
    Abstract: A process for producing macrocyclic polyester oligomers from polyester linears is described and the process comprises the steps of combining polyester linears and organic solvents having tin catalysts present therein.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: April 18, 1995
    Assignee: General Electric Company
    Inventors: Daniel J. Brunelle, Tohru Takekoshi
  • Method and apparatus for producing aluminide regions on superalloy substrates, and articles produced thereby
    Patent number: 5407705
    Abstract: A method and an apparatus for producing an adherent and oxidation-resistant aluminide region on the surface of a nickel- or cobalt-based superalloy article. A hypo-stoichiometric region of nickel or cobalt aluminide is produced by chemical vapor deposition on the surface of the article. Nickel or cobalt from the superalloy surface diffuses outward into the hypo-stoichiometric region, thus preventing migration of various refractory elements generally present in the superalloy, whose presence has a detrimental effect on the adhesion and oxidation resistance of a conventional aluminide region. A hyper-stoichiometric region of nickel or cobalt aluminide is then deposited by chemical vapor deposition on the hypo-stoichiometric region, to provide a sufficient supply of aluminum on the exposed surface of the article for forming a tough oxidation-resistant scale of alumina.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: April 18, 1995
    Assignee: General Electric Company
    Inventor: Himanshu B. Vakil
  • Method for making aromatic organic carbonates
    Patent number: 5399734
    Abstract: Improved yields of aromatic organic carbonates made by the palladium catalyzed direct carbonylation of aromatic organic hydroxy compounds can be achieved if the total gas pressure and partial pressure of carbon monoxide and oxygen are substantially maintained during the reaction.
    Type: Grant
    Filed: July 20, 1993
    Date of Patent: March 21, 1995
    Assignee: General Electric Company
    Inventors: Joseph A. King, Jr., Patricia D. Mackenzie, Eric J. Pressman
  • Polyurethane foam of low thermal conductivity and method of preparation
    Patent number: 5397809
    Abstract: Polyurethane foam of low thermal conductivity is prepared by employing carbon dioxide as a blowing agent, preferably in combination with a halogenated compound, typically a halocarbon or halohydrocarbon such as monofluorotrichloromethane or 1,1-dichloro-1-fluoroethane, and incorporating in the foam a carbon dioxide-reactive reagent. Sodium hydroxide and soda lime are illustrative carbon dioxide-reactive reagents. The carbon dioxide is preferably formed in situ by the reaction of water with the diisocyanate precursor of the polyurethane, and the carbon dioxide-reactivereagent is preferably introduced in admixture with a portion of the polyol precursor.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: March 14, 1995
    Assignee: General Electric Company
    Inventors: William J. Ward, III, James Day, Monica A. Ferrero-Heredia, Edward J. McInerney
  • Apparatus for chemical vapor deposition of diamond including thermal spreader
    Patent number: 5397396
    Abstract: Temperature uniformity and control in apparatus for chemical vapor deposition of diamond is improved by contacting the rear of the substrate assembly, which may be a substrate or a holder containing substrates, with a thermal spreader, preferably of copper and preferably having heating means embedded therein or associated therewith. The thermal spreader contacts a thermal resistance unit, preferably of stainless steel, which in turn is in contact with a cooling element that preferably has coolant passages therein.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: March 14, 1995
    Assignee: General Electric Company
    Inventors: Philip G. Kosky, Erik O. Einset, David W. Woodruff
  • Preparation of electroless nickel coating having improved properties
    Patent number: 5397599
    Abstract: Increases in surface resistivity of electroless nickel coatings on polycarbonate-containing substrates are inhibited by employing two electroless nickel plating solutions. The first solution is one which deposits a metal layer containing phosphorus, if any, in an amount up to 5% by weight and is used to deposit a layer at least 0.5 micron thick. The second solution is one which deposits a layer containing phosphorus in the amount of at least 5% and preferably at least 6% by weight. Another metal layer may be interposed between the two nickel layers.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: March 14, 1995
    Assignee: General Electric Company
    Inventors: Herbert Shin-I Chao, Bradley R. Karas, Donald F. Foust
  • Thermoplastic olefin copolymers and blends prepared therefrom
    Patent number: 5393833
    Abstract: Novel thermoplastic olefin copolymers and blends comprising the same are prepared from precursor functionalized olefin polymers and functionalized addition polymers. Additionally, the thermoplastic olefin copolymers comprise ester linkages and sulfide linkages.
    Type: Grant
    Filed: December 2, 1993
    Date of Patent: February 28, 1995
    Assignee: General Electric Company
    Inventors: Farid F. Khouri, Gregory J. Stoddard
  • Polycarbonate compositions comprising thermoplastic olefin copolymers
    Patent number: 5391616
    Abstract: Novel polycarbonate compositions comprising blends which contain thermoplastic olefin copolymers are prepared from precursor orthoester and orthocarbonate functionalized olefin polymers and functionalized polymers and the novel polycarbonate compositions display improved physical properties.
    Type: Grant
    Filed: December 22, 1993
    Date of Patent: February 21, 1995
    Assignee: General Electric Company
    Inventors: Farid F. Khouri, Gregory J. Stoddard
  • Silylated agents useful for absorbing ultraviolet light
    Patent number: 5391795
    Abstract: Novel silylated agents capable of absorbing ultraviolet light are incorporated into silicone hardcoats and used to coat polycarbonate substrates. The coated polycarbonate substrates display improved resistances to abrasion and ultraviolet light.
    Type: Grant
    Filed: February 18, 1994
    Date of Patent: February 21, 1995
    Assignee: General Electric Company
    Inventor: James E. Pickett
  • Method for making aromatic polycarbonates
    Patent number: 5391692
    Abstract: A method is provided for making polycarbonate utilizing an effective amount of a phase transfer catalyst, such as tetrabutylammonium bromide as a condensation catalyst during the interfacial phosgenation of a bisphenol, such as bisphenol A. Improved phosgene utilization is achieved.
    Type: Grant
    Filed: February 2, 1994
    Date of Patent: February 21, 1995
    Assignee: General Electric Company
    Inventors: Eugene P. Boden, Peter D. Phelps, David L. Ramsey, Paul D. Sybert, Larry I. Flowers, Roy R. Odle
  • Apparatus for chemical vapor deposition of diamond including graphite substrate holders
    Patent number: 5391229
    Abstract: Graphite substrate holders for employment in apparatus for chemical vapor deposition of diamond decrease the tendency of the formed diamond sheets to crack or shatter upon separation from the substrates. Said holders and the substrates therein preferably have rounded edges, to suppress crack formation at sharp corners. The holders are preferably coated, at least in part, with a tie-layer and a hydride-forming metal such as niobium. Also, certain maximum distances between the edges of the holder and substrates are preferably maintained in order to prevent contact of diamond with a heated filament employed for thermal activation.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: February 21, 1995
    Assignee: General Electric Company
    Inventors: Philip G. Kosky, David E. Slutz, Friedel S. Knemeyer
  • Insulating foam of low thermal conductivity and method of preparation
    Patent number: 5389695
    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: December 22, 1993
    Date of Patent: February 14, 1995
    Assignee: General Electric Company
    Inventors: Heinz Jaster, William J. Ward, III
  • Method for polymerizing macrocyclic poly(alkylene dicarboxylate) oligomers
    Patent number: 5389719
    Abstract: Cyclic tin catalysts are employed for the preparation of branched polyesters from macrocyclic polyester oligomers.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: February 14, 1995
    Assignee: General Electric Company
    Inventors: Tohru Takekoshi, Eric J. Pearce
  • Branched polyesters prepared from macrocyclic poly(Alkylene Dicarboxylate) oligomers
    Patent number: 5387666
    Abstract: Cyclic tin catalysts are employed for the preparation of branched polyesters from macrocyclic polyester oligomers. They are less susceptible than previously known catalysts to the presence of acidic impurities in the oligomer compositions.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: February 7, 1995
    Assignee: General Electric Company
    Inventors: Tohru Takekoshi, Eric J. Pearce
  • Trisstannoxanes useful for polymerizing macrocyclic poly(alkylene dicarboxylate) oligomers
    Patent number: 5386037
    Abstract: Novel trisstannoxanes are prepared by the reaction of a dialkyltin oxide with a trihydroxy compound such as 1,1,1-tris(hydroxymethyl)propane. They may be employed as catalysts for the preparation of branched polyesters from macrocyclic polyester oligomers. They are less susceptible than previously known catalysts to the presence of acidic impurities in the oligomer compositions.
    Type: Grant
    Filed: June 20, 1994
    Date of Patent: January 31, 1995
    Assignee: General Electric Company
    Inventors: Tohru Takekoshi, Eric J. Pearce
  • Polyarylene ether-organopolysiloxane copolymers
    Patent number: 5385984
    Abstract: Polyarylene ether-organopolysiloxane copolymers are provided having amine, or ester connecting linkages between blocks resulting from the melt extrusion of epoxy, carboxy or amine functionalized polyarylene ether with epoxy, carboxy or amine functionalized organopolysiloxane.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: January 31, 1995
    Assignee: General Electric Company
    Inventors: Margaret L. Blohm, Sterling B. Brown, George T. Seeger, Patricia P. Anderson
  • Core-shell ABS copolymers and method for their preparation
    Patent number: 5384361
    Abstract: Core-shell ABS copolymers having an SAN shell completely surrounding the diene core are provided by melt blending an aliphatic diene polymer with an SAN copolymer, said copolymer containing functional groups capable of reacting with the diene polymer. For example, the SAN copolymer may contain azide groups capable of reacting with the olefinic groups in the diene polymer, or both the SAN copolymer and the diene polymer may contain other functional groups capable of interreaction, such as acidic (e.g., maleic anhydride) groups in the diene and epoxy (e.g., glycidyl methacrylate) groups in the SAN copolymer.
    Type: Grant
    Filed: November 8, 1993
    Date of Patent: January 24, 1995
    Assignee: General Electric Company
    Inventors: James J. Scobbo, Jr., Gregory J. Stoddard