Patents by Inventor John B. Penn

John B. Penn 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).

  • Low molecular weight polystyrene resin and methods of making and using the same
    Patent number: 8946365
    Abstract: A low z-average molecular weight, high softening point polystyrene resin having a narrow molecular weight distribution, as well as methods of making and using the same, are provided. The use of an inert solvent and/or the order of addition of reactants during polymerization may contribute to the unique properties of the final homopolymeric resin. The polystyrene resin can be partially or fully hydrogenated and may have particular use as a tackifying agent in a variety of hot melt adhesive and rubber compositions.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: February 3, 2015
    Assignee: Eastman Chemical Company
    Inventors: Wei Min Cheng, Puthenkovilakom Rajesh Raja, George Joseph Kutsek, John B. Penn
  • Low molecular weight polystyrene resin and methods of making and using the same
    Patent number: 8829105
    Abstract: A low z-average molecular weight, high softening point polystyrene resin having a narrow molecular weight distribution, as well as methods of making and using the same, are provided. The use of an inert solvent and/or the order of addition of reactants during polymerization may contribute to the unique properties of the final homopolymeric resin. The polystyrene resin can be partially or fully hydrogenated and may have particular use as a tackifying agent in a variety of hot melt adhesive and rubber compositions.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: September 9, 2014
    Assignee: Eastman Chemical Company
    Inventors: Wei Min Cheng, Puthenkovilakom Rajesh Raja, George Joseph Kutsek, John B. Penn