Patents by Inventor Delmas B. Pennington

Delmas B. Pennington 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).

  • Crack propagation resistant acrylic sheet
    Patent number: 4505972
    Abstract: Improved crack propagation resistant acrylic sheets are provided: These sheets are prepared by copolymerizing methyl methacrylate with minor amounts of lower alkyl (C.sub.2 -C.sub.4) methacrylates. One and one quarter inch thick sheets polymerized from a monomer mixture of about 88 weight percent methyl methacrylate and about 12 weight percent butyl methacrylate or from about 76 weight percent methyl methacrylate and about 24 weight percent ethyl methacrylate are useful as indoor and outdoor ballistic glazing materials.
    Type: Grant
    Filed: November 14, 1983
    Date of Patent: March 19, 1985
    Assignee: Rohm and Haas Company
    Inventors: Thomas S. Moore, Delmas B. Pennington