The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2001
Filed:
May. 21, 1999
Applicant:
Inventors:
Jacob B. Angelo, Spring, TX (US);
Christopher Jeffrey Still Kent, Baton Rouge, LA (US);
Frederick Michael Gragg, El Lago, TX (US);
Assignee:
Exxon Research and Engineering Company, Annandale, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10M / ;
U.S. Cl.
CPC ...
C10M / ;
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.