Granted Patent
Utility
US 4,568,464 · App. 06/571,132
Anaerobic filter
Inventors:
George A. Blay, Enrique R. Witt
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Jan 16, 1984
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.