Patents by Inventor William M. Hardam

William M. Hardam 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).

  • Photographic element with antistatic polymers
    Patent number: 4810624
    Abstract: To protect photographic films from imaging by static discharges during manufacturing and customer use, copolymers of sulfonated monomers and primary amine monomers are coated on a film base and crosslinked with an aldehyde such as glutaraldehyde, or other colloid hardener giving a water-resistant, permanent, conductive (i.e., antistatic) layer.
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: March 7, 1989
    Assignee: E. I. DuPont de Nemours and Company
    Inventors: William M. Hardam, Frank L. Schadt, III, Arthur J. Taggi
  • Crosslinkable antistatic polymers and their manufacture
    Patent number: 4668748
    Abstract: To protect photographic films from imaging by static discharges during manufacturing and customer use, copolymers of sulfonated monomers and primary amine monomers are coated on a film base and crosslinked with an aldehyde such as glutaraldehyde, giving a water-resistant, permanent, conductive (i.e., antistatic) layer.
    Type: Grant
    Filed: October 19, 1984
    Date of Patent: May 26, 1987
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: William M. Hardam, Frank L. Schadt, III, Arthur J. Taggi