Patents by Inventor Stephen D Watkins

Stephen D Watkins 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 menthyl-2 pyrrolidone-5-carboxylate as an insect repellent
    Patent number: 6451844
    Abstract: The use of menthyl 2-pyrrolidone-5-carboxylate as an insect repellent, usually by application to a substrate or into an air space. The menthyl 2-pyrrolidone-5-arboxylate can be used as a composition, which may be perfumed. A useful composition comprises a mixture of menthyl 2-pyrrolidone-5-arboxylate and a known insect repellent or a compound shown to be an effective insect repellent on a test described herein.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: September 17, 2002
    Assignee: Quest International BV
    Inventors: Stephen D Watkins, Maxine J Hills, Richard A Birch
  • Solubilizing agents
    Patent number: 5635190
    Abstract: The invention related to the use of monoalkyl citrates having an alkyl group of 7-10 carbon atoms as solubilizing agents in perfumery, cosmetics, personal care and household products consisting of oil-in-water emulsions as well as to hydrophobic cosmetic, personal care and household product ingredients containing such monoalkyl citrates. The emulsions preferably contain at least 0.01% w/w of monoalkyl citrate. Especially prefereed in monooctyl citrate.
    Type: Grant
    Filed: September 19, 1995
    Date of Patent: June 3, 1997
    Assignee: Quest International B.V.
    Inventors: Peter S. J. Cheetham, Thalie P. de Graaf, Angela Janousek, Erich Klein, Stephen D. Watkins