Patents by Inventor Hans R. Frankfort

Hans R. Frankfort 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).

  • Apparatus and process for spinning polymeric filaments
    Patent number: 6444151
    Abstract: A melt spinning apparatus for spinning continuous polymeric filaments including a first stage gas inlet chamber adapted to be located below a spinneret and optionally a second stage gas inlet chamber located below the first stage gas inlet chamber. The gas inlet chambers supply gas to the filaments to control the temperature of the filaments. The melt spinning apparatus also includes a tube located below the second stage gas inlet chamber for surrounding the filaments as they cool. The tube may include an interior wall having a converging section, optionally followed by a diverging section.
    Type: Grant
    Filed: April 12, 2000
    Date of Patent: September 3, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Young D. T. Nguyen, Hans R. Frankfort, Gregory Eugene Sweet, George Vassilatos
  • Method of producing polymeric filaments
    Publication number: 20020037411
    Abstract: A method of making polymeric, e.g., polyester, filaments having low denier spread by use of a polymer of high viscosity is described. The filaments are useful to make yarns and other articles.
    Type: Application
    Filed: July 9, 2001
    Publication date: March 28, 2002
    Inventors: Hans R. Frankfort, Leonard J. Herbig, Gregory E. Sweet, George Vassilatos