Granted Patent
Utility
US 5,586,861 · App. 08/252,192
Airflow measuring centrifugal fan
Inventor:
Thomas Berger
Patented Case
View Patent ↗
Granted: Dec 24, 1996
Filed: Jun 1, 1994
Inventor
Thomas Berger
Assignee (at issue)
PACE, LLC
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.