Patents by Inventor Zafirios Grammatis

Zafirios Grammatis 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).

  • Preparation of stabilized styrene polymers
    Publication number: 20010007890
    Abstract: Stabilized styrene polymers comprising one or more vinylaromatic monomers, one or more comonomers and one or more antioxidants are prepared by polymerizing the monomers continuously and adding the antioxidants during the continuous polymerization.
    Type: Application
    Filed: November 30, 2000
    Publication date: July 12, 2001
    Inventors: Norbert NieSsner, Peter Barghoorn, Axel Gottschalk, Wolfgang Fischer, Zafirios Grammatis
  • Drying and purification of benzanthrone
    Patent number: 5281729
    Abstract: A continuous closed-system process for the environmentally friendly drying and purification of benzanthrone which comprises the steps of charging a benzanthrone-containing paste of pumpable consistency onto a melt held in a stirred kettle, dewatering and melting the paste by means of steam, condensing the water vapor emerging from the stirred kettle, flaking the melt from the stirred kettle by means of a rotating drum, and packaging the flaked solids.
    Type: Grant
    Filed: August 13, 1992
    Date of Patent: January 25, 1994
    Assignee: BASF Aktiengesellschaft
    Inventors: Klaus Borho, Zafirios Grammatis, Karl-Heinz Hennicke, Wolfgang Mach, Karl Mayer, Karl-Heinz Sartor, Wolf D. Stege, Peter Thoma, Ewald Vollmerhaus