Granted Patent
Utility
US 4,721,827 · App. 06/899,569
Crystalline magnesia-silica composites and process for producing same
Inventors:
Leonard A. Cullo, Edward F. Restelli, Jr., Francis J. Shiring, III
Patented Case
View Patent ↗
Granted: Jan 26, 1988
Filed: Aug 22, 1986
Inventors
Leonard A. Cullo
Edward F. Restelli, Jr.
Francis J. Shiring, III
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.