Granted Patent
Utility
US 4,962,268 · App. 07/314,676
Alkylation catalyst isolation
Inventor:
Keith W. Hovis
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: Feb 22, 1989
Inventor
Keith W. Hovis
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.