Granted Patent
Utility
US 4,306,629 · App. 06/203,651
Pneumatic weighing device and method
Inventor:
John Powell
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Nov 3, 1980
Inventor
John Powell
Assignee (at issue)
Geosource, 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.