Granted Patent
Utility
US 4,414,137 · App. 06/356,351
Catalytically active amorphous silica
Inventors:
Dean A. Young, Jeffery W. Koepke
Patented Case
View Patent ↗
Granted: Nov 8, 1983
Filed: Mar 9, 1982
Inventors
Dean A. Young
Jeffery W. Koepke
Assignee (at issue)
Union Oil Company of California
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.