Granted Patent
Utility
US 5,670,751 · App. 08/305,830
Bulk material weighing container with pressure feedback
Inventor:
Hans W. Hafner
Patented Case
View Patent ↗
Granted: Sep 23, 1997
Filed: Sep 14, 1994
Inventor
Hans W. Hafner
Assignee (at issue)
Pfister GmbH
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.