Granted Patent
Utility
US 4,982,873 · App. 07/255,364
Two-stage auger system for filling commercial valve bags
Inventors:
Robert G. Kelley, R. Phillip Vanausdal, Christopher S. Wadium
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Oct 7, 1988
Inventors
Robert G. Kelley
R. Phillip Vanausdal
Christopher S. Wadium
Assignee (at issue)
Stone Container 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.