Patents by Inventor Robert L. Zapp

Robert L. Zapp 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).

  • Polythiol accelerated radiation crosslinking of olefinically unsaturated polymers
    Patent number: 4144154
    Abstract: Improved radiation vulcanization of elastomers is accomplished by incorporating into the elastomer composition a polythiol, bivalent metal oxide and an aliphatic acid. The polythiol is preferably a hydrocarbon thioether thiol and is normally liquid at room temperature with a molecular weight of at least 150, said metal oxide is preferably zinc oxide and said acid is preferably stearic acid; alternatively, the reaction product of said metal oxide and acid can be used e.g., zinc stearate at appropriately increased concentration.
    Type: Grant
    Filed: June 8, 1978
    Date of Patent: March 13, 1979
    Inventors: Robert L. Zapp, Alexis A. Oswald
  • Polythiol accelerated radiation crosslinking of olefinically unsaturated allylically halogenated polymers
    Patent number: 4094757
    Abstract: Improved radiation vulcanization of elastomers is accomplished by incorporating into the elastomer composition a polythiol. The polythiol is preferably a hydrocarbon thioether thiol and is normally liquid at room temperature with a molecular weight of at least 150. Though difunctional polythiols are operative in this invention, the preferred polythiols have about three to about five thiol groups per molecule.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: June 13, 1978
    Inventors: Robert L. Zapp, Alexis A. Oswald