Patents Represented by Attorney Thomas A. Schenach
  • Patent number: 5962586
    Abstract: Improved toughened epoxy resin systems having glass transition temperatures of C. to C. are prepared by carefully curing a blend of epoxy resin or resins, all of which have an epoxy functionality of at least 2 with the mixture having an epoxy functionality greater than 2, an anhydride hardener mixture comprising a bicycloalkenedicarboxylic acid anhydride, a polybutadiene-maleic anhydride adduct, and optionally, a polybutadiene, a bismaleimide, or benzophenone tetracarboxylic acid dianhydride, preferably using a dialkyl imidazole-2-thione accelerator.
    Type: Grant
    Filed: September 27, 1994
    Date of Patent: October 5, 1999
    Inventor: John D. Harper
  • Patent number: 5629379
    Abstract: Toughened epoxy resin systems having high temperature capabilities of from to C. prepared by carefully curing blends of epoxy resins having an average epoxy functionality greater than two with bicycloalkene dicarboxylic anhydride hardener, maleinized polybutadiene toughening agent, supplemental hardener selected from the group consisting of aromatic tetracarboxylic dianhydrides and bismaelimides of aromatic diamines, and epoxy/anhydride accelerator.
    Type: Grant
    Filed: October 6, 1995
    Date of Patent: May 13, 1997
    Inventor: John D. Harper
  • Patent number: 5082920
    Abstract: Improvements in the thermal stability of bis(isoimide) resins are achieved by the addition of small amounts of trihydroxyaromatic or polyhydroxyaromatic compounds to the partially polymerized bis(isoimide) resin composition.
    Type: Grant
    Filed: September 24, 1990
    Date of Patent: January 21, 1992
    Inventor: John D. Harper
  • Patent number: 5079338
    Abstract: An improvement in thermosetting bis(isoimide) resin compositions is achieved by replacing a small part of the unsaturated carboxylic acid anhydride starting material with a stoichiometrically equivalent amount of a poly(diolefin)-unsaturated carboxylic acid anhydride adduct.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: January 7, 1992
    Inventors: Thomas A. Schenach, John D. Harper
  • Patent number: 4788312
    Abstract: Trisilahydrocarbon synthetic lubricant base stocks are prepared by the reaction of dienes containing four to sixteen carbon atoms with dihalosilanes, followed by further reaction of the bis(alkenyl)dihalosilane intermediates with trihalosilanes or trialkylsilanes, followed by substitution of the halogen atoms in the second intermediates by organometallic compounds or by hydridometallic compounds plus olefins.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: November 29, 1988
    Assignee: Technolube Division Lubricating Specialties Co.
    Inventors: Kazimiera J. L. Paciorek, Robert E. Pratt, Joseph G. Shih
  • Patent number: 4732963
    Abstract: Thermosetting bis(isoimide) resins are prepared by the reaction of an ethylenically unsaturated bis(isoimide) with a dihydric phenol.
    Type: Grant
    Filed: February 6, 1987
    Date of Patent: March 22, 1988
    Inventors: Robert L. Wank, John D. Harper
  • Patent number: 4636317
    Abstract: A process for the recycling of used and contaminated metalworking fluids, both oil-based and water-based, employing mobile equipment, is disclosed.
    Type: Grant
    Filed: July 16, 1985
    Date of Patent: January 13, 1987
    Assignee: Fluid Recycling Services, Inc.
    Inventor: Elliott W. Lewis
  • Patent number: 4192758
    Abstract: An improvement in the method of preparing high alkali value overbased magnesium sulfonate lubricant additives from commmercially available grades of magnesium oxide is disclosed.
    Type: Grant
    Filed: May 1, 1978
    Date of Patent: March 11, 1980
    Assignee: Bray Oil Company, Inc.
    Inventors: Charles R. Dickey, Paul M. Williamson
  • Patent number: 4065396
    Abstract: It has been discovered that, whereas magnesium oxide of commerce, usually made by roasting hydrated magnesia, is inert to the action of CO.sub.2 and methanol, when the oxide is made by roasting magnesium carbonate at a critical temperature in the range of F., it dissolves rapidly in anhydrous methanol under CO.sub.2 pressure, to form a methylate-carbonate. The complex can be emulsified with lubricating oil in the presence of an oil soluble surface active agent, particularly magnesium mahogany sulfonate, to produce an additive for lubricating oil having a high alkali value in the range of 100-400 mg. KOH per gram.
    Type: Grant
    Filed: November 30, 1973
    Date of Patent: December 27, 1977
    Assignee: Bray Oil Co.
    Inventors: Charles R. Dickey, Vanderveer Voorhees
  • Patent number: 4055605
    Abstract: Monoalkylphenols are made by passing a mixture of phenol and an olefin of 8-18 carbon atoms through a catalyst bed at F. The catalyst is a granular activated clay and the mol ratio of phenol to olefin charged exceeds 2.0.
    Type: Grant
    Filed: January 2, 1973
    Date of Patent: October 25, 1977
    Assignee: Calumet Petrochemicals, Inc.
    Inventor: Charles L. Jarreau, Sr.
  • Patent number: 3970570
    Abstract: An ashless sulfur-free antiwear additive combination with good oxidative stability at high temperatures is disclosed. It consists of a mixture of tricresyl phosphate and pentaerythritol monooleate, said combination exhibiting dramatically enhanced antiwear properties.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: July 20, 1976
    Assignee: Bray Oil Company
    Inventors: Robert Eugene Pratt, John Habzansky