Granted Patent
Utility
US 4,962,272 · App. 07/358,287
Treatment of arsine removal catalysts
Inventors:
Leonard A. Cullo, Edward F. Restelli, Jr.
Patented Case
View Patent ↗
Granted: Oct 9, 1990
Filed: May 30, 1989
Inventors
Leonard A. Cullo
Edward F. Restelli, Jr.
Assignee (at issue)
Aristech Chemical 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.