Patents Represented by Attorney Ralph C. Medhurst

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  • Process for producing adhesives from polyethylene terephthalate
    Patent number: 5008366
    Abstract: A process is disclosed for preparing adhesives from polyethylene terephthalate which comprises reacting a trimellitic acid polyester ether with polyethylene terephthalate to prepare a nonlinear copolymer with crosslinking characteristics suitable for use as an adhesive either as a hot-melt adhesive or as a pressure-sensitive adhesive.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: April 16, 1991
    Assignee: Amoco Corporation
    Inventor: Oscar M. Bathe
  • Hydroxyethers of epoxidized polybutenes
    Patent number: 5008338
    Abstract: A process is disclosed for preparing hydroxyethers of epoxidized polybutenes wherein the epoxide groups of said epoxidized polybutenes are about 70% trisubstituted and about 20% tetrasubstituted. Hydroxyl compounds are reacted with epoxidized polybutenes to obtain compounds of increased flexibility, water resistance, lubricity, and adhesion as compared with said hydroxyl compounds.
    Type: Grant
    Filed: January 31, 1989
    Date of Patent: April 16, 1991
    Assignee: Amoco Corporation
    Inventors: Wayne T. Riddick, Vincent F. Smith, Jr.
  • Diamond composite heat sink for use with semiconductor devices
    Patent number: 5008737
    Abstract: A composite comprised of diamond particles embedded in a metal matrix is a highly satisfactory heat sink material for use with a semiconductor.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: April 16, 1991
    Assignee: Amoco Corporation
    Inventors: Robert D. Burnham, Ricardo S. Sussmann
  • Polypropylene formulations containing small amounts of fluoborates to improve color and water carry-over
    Patent number: 5006587
    Abstract: A polypropylene composition which demonstrates good color stability and water carry-over properties comprises polypropylene containing a hindered amine light stabilizer and about 0.01 to about 0.5 wt. % of a fluoborate salt. Ammonium fluoborate, sodium fluoborate and potassium fluoborate are particularly useful.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: April 9, 1991
    Assignee: Amoco Corporation
    Inventor: Ivor R. Fielding
  • Process for oxidation of alkyl aromatic compounds
    Patent number: 5004830
    Abstract: A process is disclosed for liquid phase oxidation of alkyl aromatic hydrocarbons to aromatic carboxylic acids in presence of a multivalent catalyst promoted by a source of bromine. The oxidation is conducted in at least two oxidation reactions. Exothermic heat of reaction is controlled by means of a liquid phase heat exchanger to control temperature and pressure. Oxygen partial pressure in each stage is at least 1.5 psia to minimize oxygen starvation and improve selectivity. Low reactor temperature, high reactor pressure and improved selectivity improve product yield and product quality.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: April 2, 1991
    Assignee: Amoco Corporation
    Inventors: Chang M. Park, Wayne P. Schammel
  • Filter system
    Patent number: 5004860
    Abstract: The filter system includes a plurality of porous metal filter tubes and is used in a method for extracting high purity solid para-xylene crystals from a mother liquor feed slurry of mixed xylenes in liquid and crystal form utilizing a separation unit which includes a crystallization stage where the mother liquor slurry is cooled in at least one crystallizer to crystallize liquid para-xylene into solid crystals, an isomerization stage where xylenes, such as ortho-xylene and meta-xylene, are reacted over a catalyst bed to convert these xylenes into para-xylene, and a distillation stage where the mixed xylenes are separated from the impurities from which byproducts are obtained.
    Type: Grant
    Filed: July 28, 1986
    Date of Patent: April 2, 1991
    Assignee: Amoco Corporation
    Inventors: John S. Hansen, William A. Waranius
  • Polyamide, polyimide, and polyamide-imide polymers and copolymers using 3, 5-diamino-t-butylbenzene
    Patent number: 5003037
    Abstract: Soluble, film-forming, polyamides, polyimides, and polyamide-imides and their copolymers made using 3,5-diamino-t-butylbenzene are described. These polymers have some solubility in organic solvents such as N-methylpyrrolidone, a high Tg, excellent thermal stability, lower density and lower moisture uptake 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: August 3, 1990
    Date of Patent: March 26, 1991
    Assignee: Amoco Corporation
    Inventors: David J. Fenoglio, Douglas E. Fjare, Edwin F. Morello, Neal B. Nowicki
  • Acid anhydrides and dianhydrides of disubstituted maleic anhydrides
    Patent number: 5003085
    Abstract: A process is disclosed for preparation of anhydrides containing additional carboxylic acid moieties and dianhydrides of disubstituted maleic anhydride compounds wherein the acid anhydrides and dianhydrides retain their alkene character. The resulting alkene compounds are useful as precursors for polyesters, thermally stable polyamide-imides and polyimides which are also disclosed, as well as a process for their preparation.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: March 26, 1991
    Assignee: Amoco Corporation
    Inventors: Steven J. Behrend, David A. Young, Ellis K. Fields
  • Quick-change trim press
    Patent number: 5002477
    Abstract: In a press, a platen has opposed fluid, preferably hydraulically, actuated clamp blocks thereon. Each block functions to register with an open-ended slot in a tool mount plate and upon translation of the block to enter an offset slot section in a clamped or locked relationship. The offset slot sections are opposed one another, wedge-shaped, and complementary to block configuration. The tool mount plate can be quickly and conveniently attached and aligned or removed from the platen as needed.
    Type: Grant
    Filed: December 8, 1988
    Date of Patent: March 26, 1991
    Assignee: Amoco Corporation
    Inventors: Charles B. Case, Michael G. Martell
  • Poly(phenylene oxide)-poly(aryl ether ketone) blends
    Patent number: 5001200
    Abstract: Described herein are isomorphic blends of poly(phenylene oxide) and poly(aryl ether ketones) having less than about 30 mole percent and preferably less than about 25 mole percent of keto groups based on the total keto and ether groups. The blends are particularly desirable for use as an electrical insulation for electrical conductors.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventors: Robert A. Clendinning, James E. Harris, Markus Matzner, Lloyd M. Robeson
  • Kerogen agglomeration process for oil shale beneficiation
    Patent number: 5000389
    Abstract: In a kerogen agglomeration process, a substantial amount of the oil shale is comminuted to a top size greater than about 0.4 to 8 in. prior to kerogen agglomeration. Kerogen agglomeration includes comminuting the oil shale in the presence of an added organic liquid and water to form kerogen-rich agglomerates and mineral-rich particles.
    Type: Grant
    Filed: November 9, 1989
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventors: Bernard Y. C. So, Terry L. Marker
  • Process for protecting bearings in steel mills and other metal processing mills
    Patent number: 5000862
    Abstract: A process is provided for lubricating and protecting bearings in steel and process mills. In the process, metal is processed in the mill and conveyed on caster rollers. The caster rollers are lubricated with a special grease which enhances the longevity of the rollers, protects the rollers from rust and corrosion, and prevents the grease from leaking out of the rollers. In the preferred form, the grease comprises a water-resistant polymer to prevent the grease from washing out of the rollers and bearings when the metal workpiece is quenched with a high pressure water spray.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventor: John A. Waynick
  • Halocarbon conversion
    Patent number: 5001293
    Abstract: A method for converting halocarbons, especially lower halocarbons like chloromethane, especially methyl chloride, to hydrocarbons, especially higher molecular weight hydrocarbons, wherein a reaction mixture including the halocarbons is contacted with a borosilicate-containing catalytic composition having a specified composition in terms of mole ratios of oxides and a specified X-ray diffraction pattern to form a product mixture of the desired hydrocarbon(s).
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventors: Philip O. Nubel, Charles A. Lutman
  • Preparation of polyethylene terephthalate
    Patent number: 5001216
    Abstract: A process is disclosed for preparing polyethylene terephthalate having a predetermined intrinsic viscosity which involves the direct esterification of terephthalic acid with ethylene glycol followed by the polycondensation of the esterification product using a polycondensation catalyst system containing cobalt, manganese-, and antimony-containing components.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventors: David E. James, Lawrence G. Packer
  • Process for recovering 4,4' dihydroxydiphenyl sulfone from an isomer mixture
    Patent number: 5001270
    Abstract: A process for recovering 4,4' bisphenol sulfone from an isomer mixture comprising the 4,4' and 2,4' isomers of bisphenol sulfone, which process comprises dissolving the isomer misture in a basic aqueous solution and adding a non-neutralizing amount of acid to selectively precipitate crystals of 4,4' bisphenol sulfone.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventors: Fred Zemlanicky, Bernard Cooker
  • Palladium catalyst reactivation
    Patent number: 4999326
    Abstract: A reactivation process for a deactivated supported palladium catalyst involves contacting the catalyst with an organic polar solvent for naphthalenic compounds at a temperature below about 200.degree. C. The organic polar solvent has a dielectric constant at 25.degree. C. in the range of about 4 to about 80 and has a boiling point at atmospheric pressure in the range of about 30.degree. C. to about 230.degree. C. Preferred organic polar solvents are acetone and methanol, as well as mixtures thereof.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: March 12, 1991
    Assignee: Amoco Corporation
    Inventors: David L. Sikkenga, Ian C. Zaenger, Gregory S. Williams
  • Process for regenerating spent heavy hydrocarbon hydroprocessing catalyst
    Patent number: 4997799
    Abstract: The present invention relates to a spent hydroprocessing catalyst regeneration process wherein the catalyst is subjected to an initial partial decoking step, followed by the addition of at least one rare earth metal, and then subjected to a final decoking step.
    Type: Grant
    Filed: June 20, 1990
    Date of Patent: March 5, 1991
    Assignee: Amoco Corporation
    Inventors: Frederick T. Clark, Albert L. Hensley, Jr.
  • Maleic anhydride catalysts and process for their manufacture
    Patent number: 4996179
    Abstract: A catalyst comprising a phosphorus-vanadium mixed oxide and existing in the form of geometric shapes, such as tablets, provides minimum expansion of the geometric shapes under process reaction conditions, since the catalyst in the form of said geometric shapes has been heated in an inert atmosphere at a temperature within the range of about 343.degree. C. (650.degree. F.) to about 704.degree. C. (1,300.degree. F.) prior to being exposed to an oxygen-containing atmosphere at an elevated temperature. This catalyst is suitable for the oxidation of a hydrocarbon, such as benzene or n-butane, to maleic anhydride.
    Type: Grant
    Filed: February 22, 1990
    Date of Patent: February 26, 1991
    Assignee: Amoco Corporation
    Inventors: Muin S. Haddad, Bernard L. Meyers, William S. Eryman
  • Package and the like
    Patent number: D315100
    Type: Grant
    Filed: August 22, 1988
    Date of Patent: March 5, 1991
    Assignee: Amoco Corporation
    Inventor: Timothy K. Sheehan
  • Flow indicator for a fuel dispenser
    Patent number: D315526
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: March 19, 1991
    Assignee: Amoco Corporation
    Inventor: Norman D. Esau