Patents by Inventor Philip L. Williams

Philip L. Williams 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: 4664847
    Abstract: A hydrophilic monomer such as hydroxypropyl methacrylate and a lipophilic monomer such as lauryl methacrylate are copolymerized in the presence of a fragrance or other volatile active ingredient. The resulting polymer contains entrapped active ingredient which tends not to exude from the polymer during storage yet is gradually released as vapor when the polymer is exposed to the atmosphere, e.g. as an air-freshener.
    Type: Grant
    Filed: August 3, 1984
    Date of Patent: May 12, 1987
    Assignee: Hydro Optics, Inc.
    Inventor: Philip L. Williams