Patents by Inventor Herman H. Forsten

Herman H. Forsten 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).

  • Fire-resistant material comprising a fiberfill batt and at least one fire-resistant layer of aramid fibers
    Patent number: 5578368
    Abstract: A fire-resistant material used in items such as sleeping bags, comforters, wearing apparel, upholstered furniture and mattress tops comprises a fiberfill batt and a layer of a fire-resistant aramid fiber contacting at least one side of the aramid fiber layer. The fiberfill batt may comprise synthetic fiber, which may be either polyester fiber or polyolefin fiber. Alternatively, the fiberfill batt may comprise natural fiber. The aramid fiber layer may comprise poly(m-phenylene isophthalamide) fiber, poly(p-phenylene terephthalamide) fiber or a blend of poly(m-phenylene isophthalamide) and poly(p-phenylene terephthalamide) fiber. The aramid fiber layer may be needle-punched, hydroentangled, or laminated to the fiberfill batt.
    Type: Grant
    Filed: July 29, 1994
    Date of Patent: November 26, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Herman H. Forsten, Michael S. Frankosky, Wo K. Kwok
  • Fire resistant fabrics with a flocked nylon surface
    Patent number: 5320890
    Abstract: Spunlaced fabrics from poly(p-phenylene terephthalamide) or mixtures thereof with poly(m-phenylene isophthalamide) fibers having a specified flocked nylon surface can be dyed or printed and the flock does not significantly reduce the fire resistance of the base fabric.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: June 14, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Anthony Anton, Gordon R. Cotman, Jr., Herman H. Forsten
  • Filter bag for hot gases
    Patent number: 5171339
    Abstract: As a cloth for filter bags, a laminate comprising thin layer of nonwoven poly(p-phenylene terephthalamide) needled to a felt of poly(m-phenylene isophthalamide), polyester or polyphenylenesulfide fiber felt increases the resistance to burn through by hot sparks.
    Type: Grant
    Filed: November 7, 1991
    Date of Patent: December 15, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Herman H. Forsten
  • Light weight filter felt
    Patent number: 4536439
    Abstract: Nonwoven fabrics of poly(m-phenylene isophthalamide) having a cross-machine modulus greater than 40, and good resistance to abrasion that is useful as a gas filtration substrate, and the process of producing such a fabric by heating an entangled web while stretching the fabric transversely 5 to 15% for a time sufficient to increase the crystallinity index at least about 0.05 units.
    Type: Grant
    Filed: January 7, 1985
    Date of Patent: August 20, 1985
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Herman H. Forsten
  • Filter of poly(tetrafluoroethylene) and glass fibers
    Patent number: 4361619
    Abstract: 65-99 percent by weight poly(tetrafluoroethylene) fibers and 1-35 percent by weight glass fibers are combined in an intimate blend suitable for the preparation of filter felts having reduced leakage while maintaining high permeability to gas flow.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: November 30, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Herman H. Forsten, Peter E. Frankenburg, Jagdish N. Shah