Patents by Inventor Frederick Michael Gragg

Frederick Michael Gragg 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).

  • High stress electrical oil
    Patent number: 6214776
    Abstract: An oil composition useful as a high stress electrical oil and especially as a transformer load tap changer oil is provided. The composition comprises a major amount of a paraffinic oil having a low viscosity of less than about 20 cSt @ 40° C. and an effective amount of an additive system including at least one hindered phenolic antioxidant and a benzotriazole metal deactivator.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: April 10, 2001
    Assignee: Exxon Research and Engineering Company
    Inventors: Jacob B. Angelo, Christopher Jeffrey Still Kent, Frederick Michael Gragg