Granted Patent
Utility
US 4,352,738 · App. 06/205,388
Anaerobic filter
Inventors:
George A. Blay, Enrique R. Witt
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Nov 10, 1980
Inventors
George A. Blay
Enrique R. Witt
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.