Patents by Inventor Walter G. De Witt, III

Walter G. De Witt, III 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).

  • Patent number: 4356229
    Abstract: This invention concerns a nonwoven fabric particularly adapted for use as a diaper coverstock. The fabric consists essentially of fibers and a binder wherein at least 50%, by weight, of the fibers are hydrophobic fibers. The binder comprises a water insoluble, hydrophobic, emulsion copolymer of ethylenically unsaturated monomers comprising (A) 1 to 8% by weight of a monoethylenically unsaturated carboxylic acid, or a mixture thereof, (B) 50 to 75% by weight of a C.sub.4 to C.sub.8 alkyl acrylate or a mixture thereof, and (C) 20 to 49% by weight of methyl methacrylate, styrene, .alpha.-methyl styrene or a mixture thereof. The fabric has sufficient wet tensile strength for use as a diaper coverstock.
    Type: Grant
    Filed: October 20, 1980
    Date of Patent: October 26, 1982
    Assignee: Rohm and Haas Company
    Inventors: John G. Brodnyan, Walter G. De Witt, III, Robert A. Gill, Gary D. Stelling
  • Patent number: 4202924
    Abstract: Coating compositions comprising an acrylic solution polymer having a molecular weight of about 30,000 to 250,000 and a Tg above 65.degree. F., a solvent therefor, and a compatible acrylic polymer having a Tg less than -20.degree. F., which is soluble in the same solvent, coated substrates, and especially coated impact-modified acrylic sheets having improved resistance to impact.
    Type: Grant
    Filed: October 20, 1977
    Date of Patent: May 13, 1980
    Assignee: Rohm and Haas Company
    Inventor: Walter G. De Witt, III