Granted Patent
Utility
US 5,419,873 · App. 07/794,746
Apparatus for transfer of acid catalyst
Inventors:
Keith W. Hovis, Henry K. Hachmuth
Patented Case
View Patent ↗
Granted: May 30, 1995
Filed: Nov 19, 1991
Inventors
Keith W. Hovis
Henry K. Hachmuth
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.