Granted Patent
Utility
US 4,428,242 · App. 06/357,261
Flowmeter using twisting torque
Inventor:
John R. Holstrom
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Mar 11, 1982
Inventor
John R. Holstrom
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.