Granted Patent
Utility
US 4,415,453 · App. 06/401,783
Anaerobic treatment
Inventors:
Enrique R. Witt, William J. Humphrey, James P. Cave
Patented Case
View Patent ↗
Granted: Nov 15, 1983
Filed: Jul 26, 1982
Inventors
Enrique R. Witt
William J. Humphrey
James P. Cave
Assignee (at issue)
Celanese GmbH
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.