Granted Patent
Utility
US 3,978,137 · App. 05/558,407
Oxidation of sulfur-containing compounds
Inventor:
Robert R. Frame
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Mar 14, 1975
Inventor
Robert R. Frame
Assignee (at issue)
Universal Oil Products 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.