Patents Represented by Attorney Joseph J. Dvorak

Find this attorney in the Justia Lawyer Directory

  • Acidic promotion of transition metal sulfide catalysts for selective hydrogenation
    Patent number: 4950386
    Abstract: It has now been discovered that hydrocarbon feeds containing a polycyclic aromatic compound or mixtures thereof can be selectively hydrogenated by contacting the feed with a transition metal catalyst and hydrogen in the presence of an acid to provide a hydrocarbon mixture in which the aromatic content consists substantially of mono- and di-aromatic compounds. Useful acids include Lewis acids and acids having a pKa in the range of 0 to about -10.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: August 21, 1990
    Assignee: Exxon Research and Engineering Company
    Inventor: Manuel A. Francisco
  • Diffusion of elements into steel by catalyzed oxide reduction
    Patent number: 4904500
    Abstract: A process for diffusing silicon into iron or iron alloy by heating the iron or iron alloy with silica and a suitable reducing agent in the presence of a catalyst.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: February 27, 1990
    Assignee: Exxon Research and Engineering Company
    Inventor: Richard C. Krutenat
  • Preparation and use of catalysts comprising a mixture of tungsten oxide and silica supported on a boehmite-like surface
    Patent number: 4891127
    Abstract: Useful cracking catalysts and catalyst supports comprising a mixture of tungsten oxide and silica supported on a boehmite-like surface which, in turn, is supported on alumina are prepared by forming a composite of particles of (a) tungsten oxide, (b) silica and (c) boehmite and subjecting the composite to steaming at a temperature of at least about 500.degree. C. During the steaming, the tungsten oxide and silica react with the surface of the boehmite as the boehmite converts to alumina.
    Type: Grant
    Filed: February 15, 1989
    Date of Patent: January 2, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: Lawrence L. Murrel, Nicholas C. Dispenziere, Jr.
  • Quaternary salts of quinoline oligomer as metal surface protective materials (C-2212)
    Patent number: 4880907
    Abstract: Novel oligomeric quinolinium salts are disclosed. These are formed by reacting quinoline oligomers with alkylating agents such as benzyl halide, p-.alpha.-xylenyl dihalide and alkyl sulfates. The novel oligomeric quinolinium salts are useful as metal corrosion inhibitors, and especially as aqueous acid corrosion inhibitors. The novel compounds are represented by the formulae: ##STR1## wherein n and m are integers, with n being greater than 2 and up to about 200 and m being equal to or greater than 1, R is H or an alkyl group having from 1 to about 20 carbon atoms, R.sup.1 is an alkyl group having 1 to about 20 carbon atoms, X.sup.- is a chloride, bromide or iodide and Z.sup.- is an anion selected from BF.sub.4.sup.-, SO.sub.4.sup.=, ClO.sub.4.sup.-, PF.sub.6.sup.- and HSO.sub.4.sup.-.
    Type: Grant
    Filed: February 12, 1988
    Date of Patent: November 14, 1989
    Assignee: Exxon Research and Engineering Company
    Inventor: Long Y. Chiang
  • Bis imidazole ethers as metal deactivators
    Patent number: 4869838
    Abstract: Bis imidazole ethers have been found to be effective metal deactivators. Thus, one aspect of the present invention comprises novel bis imidazole ethers of the formula: ##STR1## in which R is a normal alkyl group having from 1 to 12 carbon atoms and R' is a normal alkyl group having from 1 to carbon atoms, an alkylaryl group having from 7 to 20 carbon atoms, or an aryl group of 6 to 10 carbon atoms. In another aspect of the present invention, an improved lubricating oil is provided comprising a base lubricating oil and the bis imidazole ethers of this invention.
    Type: Grant
    Filed: August 25, 1988
    Date of Patent: September 26, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Sergiu M. Gorun, John W. Frankenfeld
  • Low BTU gas staged air burner for forced-draft service
    Patent number: 4859173
    Abstract: In its simplest sense, the burner of the present invention includes a swirl chamber for creating a swirling flow path for primary combustion air. The burner also includes means communicating with the swirl chamber for introducing low heating value gas to the primary combustion air for discharge with the air into a flame zone. Also provided are means adjacent to each other for introducing secondary air and for introducing secondary low heating value gas positioned so that the secondary air and secondary low heating value gas intersect the flame zone, preferably above the region of the recirculating core of the flame and at such a point that the secondary air and low heating value gas have a minimal effect on the swirl aerodynamics of the flame.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: August 22, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Lester W. Davis, Jr., John P. Geosits, Dennis L. Juedes, Edward F. Kiczek
  • Ashless anti-wear additives
    Patent number: 4840741
    Abstract: An anti-wear additive for a functional fluid, such as a lube oil, is disclosed. The additive comprises selected substituted pyridines, pyrimidines, pyrazines, pyridazines and/or fused ring derivatives thereof.
    Type: Grant
    Filed: August 17, 1987
    Date of Patent: June 20, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Morton Beltzer, Said Jahanmir
  • Promoted molybdenum and tungsten sulfide catalysts, their preparation and use
    Patent number: 4839326
    Abstract: This invention relates to a process for the preparation of promoted molybdenum and tungsten sulfide catalysts, the catalysts prepared by such process, and to the use of such catalysts for hydroprocessing processes, particularly hydrotreating. More particularly, this invention relates to the preparation and use of promoted catalysts useful for hydroprocessing processes such as hydrotreating wherein said catalysts are formed by treating molybdenum and tungsten sulfide-containing material (which may be supported) with a low valence promoter metal selected from transition metals particularly the group of Fe, Co, Ni.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: June 13, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Thomas R. Halbert, Edward I. Stiefel, Russell R. Chianelli, Teh C. Ho
  • Hydroconversion process using aromatic metal chelate compositions
    Patent number: 4836912
    Abstract: Disclosed are hydroconversion processes catalyzed by aromatic-metal chelate compositions which are deficient in hydrogen, are cross-linked, and which are comprised of two or more heteroatoms, wherein at least one of the heteroatoms are part of a 5 to 6 member heterocyclic ring, and wherein the metal constituent is selected from Groups III, IVB, VB, VIB, VIIB, and VIII of the Periodic Table of the Elements, and the heteroatom is selected from sulfur, oxygen, and nitrogen.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: June 6, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Richard H. Schlosberg, William N. Olmstead
  • Aluminide dispersed ferrite diffusion coating on austenitic stainless steel substrates
    Patent number: 4835010
    Abstract: A process for the co-diffusion of aluminum and other elements into austenitic steel which includes heating the steel to a temperature at which co-diffusion occurs in the presence of a source of aluminum, a catalyst and metallic or metalloid elements having substantial solubility in ferrite (bcc phase of iron or iron alloy) so that a microstructure is formed on the steel which is a single layer composite and which includes a fine dispersion of compatible aluminide particles in a continuous ductile ferrite matrix.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: May 30, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Richard C. Krutenat, Narasimha-Rao V. Bangaru
  • Synthesis of novel highly intrinsic conducting organic polymers
    Patent number: 4833232
    Abstract: A conducting organic polymer including a cross-linked polyquinoline network and a process for making it.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: May 23, 1989
    Assignee: Exxon Research and Engineering Company
    Inventor: Long Y. Chiang
  • Tetranuclear sulfido-bridged complex of Cr(III) having a strongly magnetic ground state
    Patent number: 4832877
    Abstract: Broadly stated, the present invention encompasses tetranuclear sulfide-bridged complexes of Cr(III) having bridging organo-carboxylate ligands. Indeed, in one embodiment, the present invention is directed toward a novel composition of matter having a complex cation of the general formula Cr.sub.4 S(RCO.sub.2).sub.8 (L).sub.4.sup.2+, wherein R represents alkyl groups having from 1 to 12 carbon atoms, L represents a ligand or ligands containing a donor atom selected from oxygen, nitrogen, carbon, and sulfur. In the complex of the present invention, the four Cr(III) atoms are bound to a central tetrahedral sulfur atom. The chromium atoms also are octahedrally coordinated with bridging carboxylates and the ligand molecule. Also, the bridging carboxylates, RCO.sub.2 of the above formula, are the same or different carboxylates.
    Type: Grant
    Filed: September 28, 1987
    Date of Patent: May 23, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Avi Bino, David C. Johnston, Edward I. Stiefel
  • Conversion of uranium hexafluoride to uranium dioxide
    Patent number: 4830841
    Abstract: The present invention contemplates the conversion of uranium hexafluoride with superheated steam to produce a fine, submicron, uranyl fluoride powder which is agglomerated and densified in a fluidized bed of a uranium oxide material. Thereafter, the agglomerated and densified uranyl fluoride is defluorinated and reduced in the fluidized bed to yield a fluoride containing uranium oxide material having a uranium to oxygen ratio of from about 1:2.0 to about 1:2.67. The so-produced fluoride contains uranium oxide material treated with steam and hydrogen to produce ceramic grade uranium dioxide.
    Type: Grant
    Filed: January 17, 1986
    Date of Patent: May 16, 1989
    Assignee: Advanced Nuclear Fuels Corporation
    Inventor: Inaky J. Urza
  • Cr-promoted hydrotreating catalysts
    Patent number: 4831002
    Abstract: Self-promoted molybdenum and tungsten sulfide hydrotreating catalysts are prepared by heating one or more water soluble catalyst precursors in a non-oxidizing atmosphere in the presence of sulfur at a temperature of at least about 200.degree. C. The precursors are (Cr.sub.x M.sub.1-x L)[Mo.sub.y W.sub.1-y O.sub.4 ].sub.1+.5x wherein M is a divalent promoter metal selected from the group consisting of Mn, Fe, Co, Ni, Cu, Zn and mixtures thereof, x is any value from about 0.2 to 1, y is any value from 0 to 1, and wherein L is a nitrogen-containing, neutral multidentate, chelating ligand. In a preferred embodiment the lligand L will comprise one or more chelating alkyl di- or triamines and the non-oxidizing atmosphere will comprise H.sub.2 S.
    Type: Grant
    Filed: July 29, 1987
    Date of Patent: May 16, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Teh C. Ho, Larry E. McCandlish, Archie R. Young, II, Edward J. Osterhuber
  • Preparation and use of catalysts comprising a mixture of tungsten oxide and silica supported on a boehmite-like surface
    Patent number: 4831007
    Abstract: Useful cracking catalysts and catalyst supports comprising a mixture of tungsten oxide and silica supported on a boehmite-like surface which, in turn, is supported on alumina are prepared by forming a composite of particles of (a) tungsten oxide, (b) silica and (c) boehmite and subjecting the composite to steaming at a temperature of at least about 500.degree. C. During the steaming, the tungsten oxide and silica react with the surface of the boehmite as the boehmite converts to alumina.
    Type: Grant
    Filed: December 31, 1985
    Date of Patent: May 16, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Lawrence L. Murrell, Nicholas C. Dispenziere, Jr.
  • Carbon-containing molybdenum and tungsten sulfide catalysts
    Patent number: 4826797
    Abstract: Catalysts comprising a carbon-containing sulfide of molybdenum or tungsten are prepared by contacting, in the presence of sulfur, hydrogen and a hydrocarbon, ammonia and ammonium substituted molybdate, thiomolybdate, tungstate and thiotungstate salts at a temperature of from about 200.degree.-600.degree. C. These catalysts are useful for hydrotreating reactions. In a preferred embodiment, these catalysts will be promoted with certain transition metal sulfides, such as cobalt sulfide, which results in catalysts having greater activity than conventional catalysts such as cobalt-molybdate on alumina.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: May 2, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Russell R. Chianelli, Theresa A. Pecoraro
  • Hydrotreating catalysts comprising a mixture of a sulfide of a promoter metal, amorphous sulfide of trivalent chromium and microcrystalline molybdenum or tungsten sulfide
    Patent number: 4824820
    Abstract: A composition of matter comprising a mixture of (i) a sulfide of at least one promoter metal selected from the group consisting of Ni, Co, Mn, Cu, Zn and mixture thereof and mixtures thereof with Fe, (ii) an amorphous sulfide of trivalent chromium and (iii) microcrystallites of metal sulfide of a metal selected from the group consisting of molybdenum, tungsten and mixture thereof. These compositions have been found to be useful hydrotreating catalysts having nitrogen removal activity superior to that of commercial catalysts such as cobalt-molybdate on alumina.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: April 25, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Allan J. Jacobson, Teh C. Ho, Russell R. Chianelli, John J. Steger, Angelo A. Montagna
  • Electrolyte additive for improved battery performance
    Patent number: 4818642
    Abstract: In one embodiment of the present invention, there is provided an electrochemical cell having a metal bromine couple. The cell includes an electrode structure on which to deposit the metal of the couple and a counterelectrode at which to generate bromine. A microporous membrane separates the electrode and counterelectrode. Importantly, the aqueous electrolyte comprises an aqueous metal bromide solution containing a water soluble bromine complexing agent capable of forming a water immiscible complex with bromine and an additive capable of decreasing the wettability of the microporous separators employed in such cells by such water immiscible bromine complexes.
    Type: Grant
    Filed: March 3, 1986
    Date of Patent: April 4, 1989
    Assignee: Exxon Research and Engineering Company
    Inventors: Richard J. Bellows, Edward Kantner
  • Hydrotreating with catalysts comprising mixtures of an amorphous sulfide or trivalent chromium and microcrystallites of molybdenum sulfide or tungsten sulfide
    Patent number: 4812227
    Abstract: A process for the hydrorefining of hydrocarbon feed to reduce the contents of sulfur and nitrogen compounds therein is disclosed which comprises contacting the hydrocarbon feed at elevated temperatures of at least about 150.degree. C. in the presence of hydrogen with a catalyst consisting essentially of mixture of (i) an amorphous sulfide of trivalent chromium and (ii) microcrystallites of metal sulfide of a metal selected from the group consisting of Mo, W and mixture thereof. These compositions have been found to be useful hydrotreating catalysts having nitrogen removal activity superior to that of commercial catalysts derived from cobalt molybdate on alumina.
    Type: Grant
    Filed: April 23, 1986
    Date of Patent: March 14, 1989
    Assignee: Exxon Research & Engineering Company
    Inventors: Allan J. Jacobson, Teh C. Ho, Russell R. Chianelli, John J. Steger, Angelo A. Montagna
  • Adamantane catalyzed paraffin isomerization
    Patent number: RE33080
    Abstract: A process is described for non-cyclic paraffin isomerization under strong acid conditions in which an adamantane hydrocarbon is used to substantially increase the reaction rate of the isomerization.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: October 3, 1989
    Assignee: Exxon Research and Engineering Company
    Inventor: George M. Kramer