Granted Patent
Utility
US 4,536,280 · App. 06/563,327
Visbreaking process
Inventors:
John B. White, Jr., Robert E. McHarg, Frank Stolfa
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Dec 19, 1983
Inventors
John B. White, Jr.
Robert E. McHarg
Frank Stolfa
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.