Granted Patent
Utility
US 4,604,206 · App. 06/782,823
Staged anaerobic reactor
Inventor:
Richard A. Sullivan
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Oct 2, 1985
Inventor
Richard A. Sullivan
Assignee (at issue)
Envirex, Inc.
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.