Granted Patent
Utility
US 4,458,023 · App. 06/438,599
Catalyst manufacture
Inventors:
William A. Welsh, Mark A. Seese, Alan W. Peters
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Nov 2, 1982
Inventors
William A. Welsh
Mark A. Seese
Alan W. Peters
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.