Granted Patent
Utility
US 4,453,419 · App. 06/444,788
Device for sensing the volmetric flow rate of air in a duct
Inventor:
Roger P. Engelke
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Nov 26, 1982
Inventor
Roger P. Engelke
Assignee (at issue)
Barber-Coleman Company
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.