Granted Patent
Utility
US 4,989,456 · App. 07/432,041
Variable area obstruction gas flow meter
Inventor:
Josef J. Stupecky
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Nov 6, 1989
Inventor
Josef J. Stupecky
Assignee (at issue)
Bicore Monitoring Systems
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.