Patents by Inventor Gretchen R. Hatfield

Gretchen R. Hatfield 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).

  • Rinse additive compositions providing glassware protection comprising insoluble zinc compounds
    Patent number: 4908148
    Abstract: Disclosed are rinse additive compositions containing an insoluble inorganic zinc salt useful for inhibition of glassware corrosion caused by automatic dishwashing detergents in the dishwasher. These compositions are particularly desirable because use of them in the dishwasher does not result in precipitation of zinc insolubles on the dishware or dishwasher parts.
    Type: Grant
    Filed: February 13, 1989
    Date of Patent: March 13, 1990
    Assignee: The Procter & Gamble Company
    Inventors: Gregory S. Caravajal, Gretchen R. Hatfield