Granted Patent
Utility
US 4,956,126 · App. 07/282,057
Metal-oxide-silica adsorbent and process for refining oil using the same
Inventors:
Leendert H. Staal, Jan C. Vis, Jan W. Groeneweg
Patented Case
View Patent ↗
Granted: Sep 11, 1990
Filed: Dec 9, 1988
Inventors
Leendert H. Staal
Jan C. Vis
Jan W. Groeneweg
Assignee (at issue)
Unilever Patent Holdings B.V.
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.