Granted Patent
Utility
US 5,489,727 · App. 08/450,448
Isopentane disproportionation
Inventors:
Bruce B. Randolph, Marvin M. Johnson
Patented Case
View Patent ↗
Granted: Feb 6, 1996
Filed: May 25, 1995
Inventors
Bruce B. Randolph
Marvin M. Johnson
Assignee (at issue)
Phillips Petroleum 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.