Patents by Inventor Thomas E. Royster

Thomas E. Royster 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).

  • One-step process for making lightly-crosslinked polyvinylpyrrolidone hydrogel
    Patent number: 5654385
    Abstract: A one-step for making a lightly-crosslinked polyvinylpyrrolidone hydrogel by polymerizing vinyl pyrrolidone in water in the presence of a suitable crosslinker such as 1-vinyl-3(E)-ethylidene pyrrolidone and a free radical initiator under initial agitation conditions sufficient to overcome the inertia of the polymer when formed.
    Type: Grant
    Filed: May 16, 1996
    Date of Patent: August 5, 1997
    Assignee: ISP Investments Inc.
    Inventors: Susan Y. Tseng, Philip F. Wolf, Thomas E. Royster