Patents by Inventor Leonard Aloysius Barber

Leonard Aloysius Barber 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).

  • Copolymers of vinylidene fluoride and hexafluoropropylene and process for preparing the same
    Patent number: 6187885
    Abstract: Melt processable copolymers of vinylidene fluoride and hexafluoropropylene, containing from about 1% to about 20% hexafluoropropylene by weight, are prepared by emulsion polymerization of vinylidene fluoride and hexafluoropropylene in a stirred aqueous reaction medium. The reaction medium is formed by charging to a heated reactor, water, vinylidene fluoride, an initiator to start the polymerization, and a water-soluble surfactant capable of emulsifying both the initiator and the reaction mass during polymerization. Additional amounts of vinylidene fluoride and initiator are fed to the reaction medium to continue polymerization of the vinylidene fluoride monomer until from about 50% to about 90% of the total weight of the vinylidene fluoride monomer utilized in the process has been added to the reaction medium.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: February 13, 2001
    Assignee: Atofina Chemicals, Inc.
    Inventor: Leonard Aloysius Barber