Patents by Inventor Dwight A. Holtzen

Dwight A. Holtzen 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).

  • Processibility and lacing resistance when silanized pigments are incorporated in polymers
    Patent number: 5631310
    Abstract: White-pigmented polymers (particularly, polyolefins such as polyethylene) containing white pigments treated with at least one silane or a mixture of at least one silane and at least one polysiloxane are disclosed to improve processibility in compounding and improve performance properties such as lacing resistance in a polymeric matrix.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: May 20, 1997
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Patricia A. Tooley, Dwight A. Holtzen, Joseph A. Musiano
  • Processibility and lacing resistance when silanized pigments are incorporated in polymers
    Patent number: 5607994
    Abstract: White-pigmented polymers (particularly, polyolefins such as polyethylene) containing white pigments treated with at least one silane or a mixture of at least one silane and at least one polysiloxane are disclosed to improve processibility in compounding and improve performance properties such as lacing resistance in a polymeric matrix.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: March 4, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Patricia A. Tooley, Dwight A. Holtzen, Joseph A. Musiano
  • Laser marking of fluoropolymer composition
    Patent number: 5560845
    Abstract: Laser marking of pigmented fluoropolymer substrates is enhanced by using titanium dioxide pigment coated with organo silane.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: October 1, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John N. Birmingham, Jr., Dwight A. Holtzen, James F. Hunt, Robert S. Jenkins, Peter D. Spohn, James T. Walnock
  • TiO.sub.2 pigments resistant to discoloration in the presence of polymer additives
    Patent number: 4999055
    Abstract: An improved inorganic pigment (e.g., TiO.sub.2), process for treating such pigment and polymer (e.g., polyethylene, polypropylene or polystyrene) incorporating such pigment wherein the inorganic pigment is coated with maleic, malonic, benzoic, fumaric, or phthalic acid or mixtures thereof. The coated pigments exhibit excellent resistance to polymer yellowing or discoloration and do not appear to degrade polymer properties.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: March 12, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Dwight A. Holtzen, Austin H. Reid, Jr.