Granted Patent
Utility
US 4,428,823 · App. 06/455,355
Integrated thermal cracking and visbreaking process
Inventors:
Norman F. Hessler, Frank Stolfa, William H. Munro
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Jan 3, 1983
Inventors
Norman F. Hessler
Frank Stolfa
William H. Munro
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.