Patents Represented by Attorney Ralph C. Medhurst

Find this attorney in the Justia Lawyer Directory

  • Amide-imide resin of lowered water absorption for molding and composite applications
    Patent number: 4970292
    Abstract: Polyamide-imides derived from trimellitic acid compounds and an aromatic diamine are improved in moisture resistance when from 10 to about 90 mole % of the trimellitic acid compound is replaced by a biphenyl tetracarboxylic acid compound.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: November 13, 1990
    Assignee: Amoco Corporation
    Inventors: Ronald E. Bockrath, Robert B. Hanson
  • Polyamide, polyimide, and polyamide-imide polymers of diamino-t-butylbenzene
    Patent number: 4968780
    Abstract: Resinous condensation polymers of polycarboxylic acid compounds and aromatic diprimary amines comprising diamino-t-butylbenzens are described. In particular, film-forming polyamides, polyimides and polyamide-imides and their copolymers made using diamino-t-butylbenzenes which have amino groups meta or para to each other on a benzene ring are described. These polymers have some solubility in organic solvents such as N-methylpyrrolidone, a high glass transition temperature, excellent thermal stability, and are useful in films, fibers and composites, and in the electronics industry as electrical component substrates, protective coatings, interlevel dielectrics and the like.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: November 6, 1990
    Assignee: Amoco Corporation
    Inventors: David J. Fenoglio, Douglas E. Fjare, John L. Melquist, Edwin F. Morello, Neal R. Nowicki
  • Catalysts for conversion of a lower alkane
    Patent number: 4968655
    Abstract: Catalysts containing a reducible compound on a silica-containing support are provided for the conversion of a lower molecular weight alkane to more valuable, higher molecular weight hydrocarbons.
    Type: Grant
    Filed: February 23, 1987
    Date of Patent: November 6, 1990
    Assignee: Amoco Corporation
    Inventors: James L. Jezl, Glenn O. Michaels, Michael J. Spangler, Mark L Winzenburg
  • Poly(aryl ether sulfone)-poly(aryl ether ketone) block copolymers block copolymers
    Patent number: 4968758
    Abstract: Novel poly(aryl ether sulfone)-poly(aryl ether ketone) block copolymers are described. They are prepared by the nucleophilic polycondensation of a hydroxy- or halo-terminated poly(aryl ether ketone) oligomer with the poly(aryl ether sulfone) forming reagents; alternatively, a preformed poly(aryl ether sulfone) block may be used.The novel copolymers are tough materials with excellent heat, solvent, and stress-crack resistanced. They display high HDT's (heat distortion temperatures) and are useful in molding, extrusion and composites applications.
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: November 6, 1990
    Assignee: Amoco Corporation
    Inventors: Markus Matzner, James H. Botkin, Paul A. Winslow
  • Maleic anhydride catalysts and process for their manufacture
    Patent number: 4965235
    Abstract: Novel maleic anhydride catalysts comprising phosphorus-vanadium oxides and phosphorus-vanadium-co-metal oxides which under reaction conditions for the manufacture of maleic anhydride from butane feedstock do not expand to the point of crushing and producing fines. The catalyst being prepared by the process comprising rapidly heating the catalyst syrup during the drying of the syrup so that it reaches a temperature of at least about 150.degree. C. in less than about 10 hours.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: October 23, 1990
    Assignee: Amoco Corporation
    Inventors: Muin S. Haddad, William S. Eryman
  • Wear resistant poly (aryl ether ketone) polyimide blends
    Patent number: 4965310
    Abstract: Blends comprising(A.) at least one poly(aryl) ether ketone), and(B.) at least one polyimide having repeating units of the formula ##STR1## wherein R.sup.1 is a substituted or unsubstituted tetravalent radical having benzenoid unsaturation, andR.sup.2 is a substituted or unsubstituted divalent group having aromatic unsaturation which is essentially free of (i) backbone ether oxygen bonded directly to the aromatic ring forming an imide linkage and (ii) amide linkages bonded through carboxyl groups bonded to the aromatic ring forming an imide linkage. The blends exhibit good melt processability and wear resistance greater than the individual blend components.
    Type: Grant
    Filed: July 25, 1985
    Date of Patent: October 23, 1990
    Assignee: Amoco Corporation
    Inventors: James E. Harris, John P. Gavula
  • Crystalline polyarylnitrile ether polymer
    Patent number: 4963643
    Abstract: Described herein are novel crystalline polyarylnitrile polymers which have excellent mechanical and thermal properties. Also, described is a process for producing such polyarylnitrile polymers.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: October 16, 1990
    Assignee: Amoco Corporation
    Inventors: Louis M. Maresca, Alford G. Farnham, Thomas H. Schwab, Ulrich A. Steiner
  • Kerogen agglomeration process for oil shale beneficiation using organic liquid in precommunication step
    Patent number: 4963250
    Abstract: In a kerogen agglomeration process, the oil shale is pretreated by comminuting the oil shale in the presence of an added organic liquid prior to contacting the oil shale with an added organic liquid and water to form kerogen-rich agglomerates and mineral-rich particles. The benefit is a reduction in comminution cost while maintaining about the same separation efficiency as methods having higher comminution costs.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: October 16, 1990
    Assignee: Amoco Corporation
    Inventors: Bernard Y. C. So, Terry L. Marker
  • Increasing viscosity storage stabiity of Mannich base dispersant/VI-improvers
    Patent number: 4963277
    Abstract: A method is described for improving the viscosity storage stability of a Mannich base condensation product of an oxidized polyolefin, formaldehyde, and an amine. This method involves contacting such Mannich base condensation product with a lower alkyl peroxide, a lower alkyl hydroperoxide or an aryl(lower)alkyl hydroperoxide at a temperature of about 250.degree. F. to about 400.degree. F. for a time period sufficient to provide an oxidized product.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: October 16, 1990
    Assignee: Amoco Corporation
    Inventors: David J. Fenoglio, Yoon S. Song, Robert J. Basalay
  • Polyamide, polyimide, and polyamide-imide polymers of diamino-t-butyltoluene
    Patent number: 4963648
    Abstract: Resinous condensation polymers of polycarboxylic acid compounds and aromatic diprimary amines comprising diamino-t-butyltoluene are described. In particular, film-forming polyamides, polyimides and polyamide-imides and their copolymers made using diamino-t-butyltoluene which have amino groups meta or para to each other on a benzene ring are described. These polymers have some solubility in organic solvents such as N-methylpyrrolidone, a high glass transition temperature, excellent thermal stability, and are useful in films, fibers and composites, and in the electronics industry as electrical component substrates, protective coatings, interlevel dielectrics and the like.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: October 16, 1990
    Assignee: Amoco Corporation
    Inventors: David J. Fenoglio, Douglas E. Fjare, John L. Melquist
  • Injection moldable blends of poly(etherketones) and polyamide-imides
    Patent number: 4963627
    Abstract: This invention relates to blends of amide-imide polymer or amide-imide-phthalamide polymer and polyaryletherketones which include an inorganic hydrate to stabilize the melt viscosity of the polymer blend. The invention also relates to a composition and a molded article.
    Type: Grant
    Filed: December 30, 1988
    Date of Patent: October 16, 1990
    Assignee: Amoco Corporation
    Inventors: Granville L. Smyser, Gary T. Brooks
  • Antifoam process for delayed coking
    Patent number: 4961840
    Abstract: An improved delayed coking process using an improved method for adding antifoam materials to the delayed coking process. The process is directed to injecting a polysiloxane antifoam material in mixture with an inert gas in the absence or substantial absence of steam and wherein this mixture is heated and thereafter injected into a delayed coking drum. The process allows improved use of antifoam materials and prevents downstream contamination of process units with silica materials which can be broken down when the polysiloxane antifoam material is contacted with large quantities of steam within the coking drum.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: October 9, 1990
    Assignee: Amoco Corporation
    Inventor: Shri K. Goyal
  • Liquid-phase xylene isomerization
    Patent number: 4962258
    Abstract: Gallium-containing, crystalline silicate molecular sieves in which substantially all of the gallium occupies molecular sieve lattice positions or is intimately associated with the crystal lattice of the silicate sieve when composited into a silica matrix are shown to form catalyst compositions having superior properties for the catalytic, liquid-phase isomerization of a xylene-containing stream containing a minor amount of ethylbenzene to a product mixture rich in paraxylene.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: October 9, 1990
    Assignee: Amoco Corporation
    Inventors: Jeffrey A. Amelse, John A. Donohue, Nancy A. Kutz, Judith B. Melville, Brian L. Slusar
  • Process to convert linear alkanes
    Patent number: 4962266
    Abstract: The invention relates to a process for the conversion of linear alkanes such as n-butane to dehydrogenated and isomerized products in the presence of a catalyst comprising a platinum component and a zincosilicate component.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: October 9, 1990
    Assignee: Amoco Corporation
    Inventor: Victor K. Shum
  • Preparation of a dimethylnaphthalene
    Patent number: 4962260
    Abstract: A method is disclosed for preparing one of more specific dimethylnaphthalene isomers by the isomerization of one or more other specific dimethylnaphthalene isomers in the liquid phase and in the presence of a solid zeolitic isomerization catalyst.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: October 9, 1990
    Assignee: Amoco Corporation
    Inventors: David Sikkenga, Ian C. Zaenger, Gregory S. Williams
  • Process for preparing polyamide-imide foam
    Patent number: 4960549
    Abstract: This invention relates to preparation of polyamide-imide foam by extruding foamable composition comprising polyamide-imide and volatiles into a confined expansion zone, expanding the composition therein and cooling the result. The resulting foams are essentially open-celled and exhibit good strength, insulating properties and other desirable features.
    Type: Grant
    Filed: May 23, 1988
    Date of Patent: October 2, 1990
    Assignee: Amoco Corporation
    Inventors: Gary T. Brooks, Brian C. Connolly, Robert Riley
  • Polyimide copolymers containing 4,4'-bis(p-aminophenoxy)biphenyl and siloxane diamine moieties
    Patent number: 4960846
    Abstract: A low modulus, solvent resistant, wet etchable polyimide useful electronic applications as passivation and insulating coatings, said polyimides containing a 4,4'-bis(p-aminophenoxy)biphenyl moiety, a siloxane diamine moiety, and a dianhydride moiety.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: October 2, 1990
    Assignee: Amoco Corporation
    Inventors: Marvin J. Burgess, David A. Wargowski, Agnes M. Palka
  • Amino-terminated poly(aryl ether ketones)
    Patent number: 4959424
    Abstract: Described herein are novel amino-terminated poly(aryl ether ketone) oligomers and methods for their production. These amino-terminated poly(aryl ether ketone) oligomers are used as building blocks for a variety of polymers and copolymers.
    Type: Grant
    Filed: July 25, 1986
    Date of Patent: September 25, 1990
    Assignee: Amoco Corporation
    Inventors: Markus Matzner, Donald M. Papuga
  • Two-catalyst hydrocracking process
    Patent number: 4959140
    Abstract: Disclosed is a hydrocracking process wherein the feedstock is contacted in a first reaction zone with a first reaction zone catalyst comprising a nickel component and a tungsten component deposed on a support component consisting essentially of an alumina component and a crystalline molecular sieve component. The effluent from the first reaction zone effluent is then contacted in a second reaction zone with a second reaction zone catalyst comprising a cobalt component and a molybdenum component deposed on a support component comprising an alumina component and a crystalline molecular sieve component.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: September 25, 1990
    Assignee: Amoco Corporation
    Inventors: Simon G. Kukes, Louis C. Gutberlet, Albert L. Hensley
  • Plate or the like
    Patent number: D312027
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: November 13, 1990
    Assignee: Amoco Corporation
    Inventors: Stephen J. Cyr, Dean J. White