Patents by Inventor Donald Leonidas Henry

Donald Leonidas Henry 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).

  • Two-part nucleating agent system
    Patent number: 5712318
    Abstract: A foam cell nucleating agent that is a combination of sulfonic or phosphonic acid or salt thereof and inorganic salt containing a polyatomic anion yields improved foaming of thermoplastic resins such as polyolefins and melt-fabricable fluoropolymers.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: January 27, 1998
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Marlin Dwight Buckmaster, Donald Leonidas Henry, Stuart Karl Randa
  • High speed extrusion
    Patent number: 5688457
    Abstract: Extrusion theology of thermoplastic polymer as manifested by surface smoothness is improved by incorporating foam cell nucleating agents into the polymer and extruding the polymer under laminar flow to form unfoamed extrudate.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: November 18, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Marlin Dwight Buckmaster, Donald Leonidas Henry, Stuart Karl Randa