Granted Patent
Utility
US 4,780,446 · App. 06/697,186
Alumina-silica cogel
Inventors:
Richard J. Nozemack, Joseph F. Porinchak
Patented Case
View Patent ↗
Granted: Oct 25, 1988
Filed: Feb 1, 1985
Inventors
Richard J. Nozemack
Joseph F. Porinchak
Assignee (at issue)
W. R. Grace & Co.
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.