Granted Patent
Utility
US 4,240,978 · App. 06/101,296
Process for sulfonation of gas oils
Inventor:
Roy C. Berg
Patented Case
View Patent ↗
Granted: Dec 23, 1980
Filed: Dec 7, 1979
Inventor
Roy C. Berg
Assignee (at issue)
UOP LLC
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.