Granted Patent
Utility
US 4,274,838 · App. 06/080,940
Anaerobic digester for organic waste
Inventors:
Eugene M. Dale, Jerry A. Malstrom
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Oct 1, 1979
Inventors
Eugene M. Dale
Jerry A. Malstrom
Assignee (at issue)
Energy Harvest, 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.