Granted Patent
Utility
US 5,437,785 · App. 08/155,649
Apparatus for dissolved gas flotation in anaerobic wastewater treatment
Inventor:
Mel Roshanravan
Patented Case
View Patent ↗
Granted: Aug 1, 1995
Filed: Nov 22, 1993
Inventor
Mel Roshanravan
Assignee (at issue)
Darling International, 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.