Granted Patent
Utility
US 4,236,030 · App. 06/000,140
Process for recovering phenols from a hydrocarbon mixture containing the same
Inventors:
Charles M. Selwitz, John G. McNulty
Patented Case
View Patent ↗
Granted: Nov 25, 1980
Filed: Jan 2, 1979
Inventors
Charles M. Selwitz
John G. McNulty
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.