Granted Patent
Utility
US 5,092,482 · App. 07/492,776
Sludge digesters with separate liquid chambers to buoy ballast members
Inventors:
Jeffrey L. Wight, Lynn W. Cook
Patented Case
View Patent ↗
Granted: Mar 3, 1992
Filed: Mar 12, 1990
Inventors
Jeffrey L. Wight
Lynn W. Cook
Assignee (at issue)
Envirotech, 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.