Granted Patent
Utility
US 4,228,024 · App. 05/954,593
Insulating oil compositions containing a fraction derived from the alkylation product of benzene with ethylene
Inventors:
Johann G. D. Schulz, Anatoli Onopchenko, William A. Kofke, Jr.
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Oct 25, 1978
Inventors
Johann G. D. Schulz
Anatoli Onopchenko
William A. Kofke, Jr.
Assignee (at issue)
Gulf Research & Development Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.