Patents by Inventor Walter DeWitt

Walter DeWitt 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).

  • Superabsorbent polymeric compositions and process for producing the same
    Patent number: 4914170
    Abstract: Superabsorbent polymeric compositions are prepared from monomer including acrylic acid and an effective amount of a second hydrophilic monomer, which can be a soluble salt of beta-acryloxypropionic acid. Preferably, the pH of the aqueous monomer solution is adjusted to substantially exclude free acid, and the aqueous monomer solution is coated onto a heated surface to both polymerize the monomer and dry the resulting hydrogel. Free acid thermal degradation products are avoided and the superabsorbent product has greater absorption capacity than acrylate homopolymer.
    Type: Grant
    Filed: November 17, 1987
    Date of Patent: April 3, 1990
    Assignee: Rohm and Haas Company
    Inventors: Ching-Jen Chang, Walter DeWitt