Granted Patent
Utility
US 5,538,053 · App. 08/483,736
Vacuum densifier with auger
Inventor:
Norwin C. Derby
Patented Case
View Patent ↗
Granted: Jul 23, 1996
Filed: Jun 7, 1995
Inventor
Norwin C. Derby
Assignee (at issue)
Better Agricultural Goals Corporation
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.