Patents by Inventor Barbara O. Yuan

Barbara O. Yuan 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).

  • Use of purified surface modifiers to prevent particle aggregation during sterilization
    Patent number: 5352459
    Abstract: This invention discloses a composition comprised of nanoparticles having a purified polymeric surfactant as a surface modifier adsorbed on the surface thereof and a cloud point modifier associated therewith, which cloud point modifier is present in an amount sufficient to increase the cloud point of the surface modifier. Preferred purified polymeric surfactants are purified polyalkyleneoxide substituted ethylenediamine surfactants. A preferred cloud point modifier is polyethylene glycol. This invention further discloses a method of making nanoparticles having a purified polymeric surfactant as a surface modifier adsorbed on the surface and a cloud point modifier associated therewith, comprised of contacting said nanoparticles with the cloud point modifier for a time and under conditions sufficient to increase the cloud point of the surface modifier.
    Type: Grant
    Filed: December 16, 1992
    Date of Patent: October 4, 1994
    Assignee: Sterling Winthrop Inc.
    Inventors: Kenneth R. Hollister, David Ladd, Gregory L. McIntire, George C. Na, Natarajan Rajagopalan, Barbara O. Yuan