Granted Patent
Utility
US 4,378,981 · App. 06/332,640
Gas separation apparatus
Inventors:
Roger S. Otstot, Charles J. Runkle
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Dec 21, 1981
Inventors
Roger S. Otstot
Charles J. Runkle
Assignee (at issue)
Monsanto 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.