Patents by Inventor Justin L. Hirshman

Justin L. Hirshman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Partial esters of epoxy containing compounds
    Patent number: 5324846
    Abstract: The present invention relates to a partial ester derived from the reaction product of an oxirane containing acid or derivative thereof, and a reactive hydroxyl compound selected from the group consisting of diols, triols, di-diols and 1,4-dihydroxy butane and a halogen containing polymer compositon thereof. The oxirane compound can be derived from the group consisting of epoxidized vegetable oil, epoxidized fish oil, an aliphatic or arylaliphatic containing craboxyl compound having an oxirane group in the aliphatic chain.
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: June 28, 1994
    Assignee: Elf Atochem North America, Inc.
    Inventors: Justin L. Hirshman, Dana S. Garcia, Mohammad R. Kazemizadeh
  • Storage-stable precursors for rigid polyurethane foams
    Patent number: 4136046
    Abstract: Diorganotin compounds wherein at least one of the remaining valences on the tin atom is satisfied by a sulfur atom or a thiocyanate group are unique among diorganotin compounds in that they retain their catalytic activity over extended periods of time in the presence of the precursors or masterbatches conventionally employed to prepare rigid, cellular polyurethanes.
    Type: Grant
    Filed: May 20, 1976
    Date of Patent: January 23, 1979
    Assignee: M&T Chemicals Inc.
    Inventors: Justin L. Hirshman, Kenneth Treadwell
  • Novel curing agents derived from organothiostannoic acids
    Patent number: 4120875
    Abstract: Epoxide compounds are cured rapidly at relatively low temperatures by reaction products of a carboxylic acid anhydride and an organothiostannoic acid anhydride or mixtures containing these two compounds. The cured products exhibit good physical and electrical properties.
    Type: Grant
    Filed: August 26, 1974
    Date of Patent: October 17, 1978
    Assignee: M&T Chemicals Inc.
    Inventors: Justin L. Hirshman, Robert V. Russo
  • Additive-containing fibers
    Patent number: 4055702
    Abstract: Additives can be permanently incorporated into melt spun fibers by cold drawing the fibers under conditions that generate a network of interconnecting microvoids within the fiber. The microvoids are formed in the presence of specified liquid or vapor media which fill the microvoid network. The temperature of the medium is below the effective glass transition temperature of the fibers containing said medium. The additive is either present in said medium or is applied to drawn fibers containing said medium.
    Type: Grant
    Filed: December 2, 1975
    Date of Patent: October 25, 1977
    Assignee: M & T Chemicals Inc.
    Inventors: Roger T. Guthrie, Justin L. Hirshman, Stanley Littman, Edwin L. Sukman, Philip H. Ravenscroft
  • Method for permanently and uniformly incorporating an additive into an undrawn fiber
    Patent number: 4001367
    Abstract: Additives can be permanently incorporated into melt spun fibers by cold drawing the fibers under conditions that generate a network of interconnecting microvoids within the fiber. The microvoids are formed concurrently with the drawing of the fiber in a non-solvent liquid or vapor media, which media fills the microvoid network. The temperature of the medium is below the effective glass transition temperature of the fibers containing said medium. The additive is either present in said medium or is applied to drawn fibers containing said medium.
    Type: Grant
    Filed: November 7, 1974
    Date of Patent: January 4, 1977
    Assignee: M & T Chemicals Inc.
    Inventors: Roger T. Guthrie, Justin L. Hirshman, Stanley Littman, Edwin L. Sukman, Philip H. Ravenscroft