Granted Patent
Utility
US 4,334,648 · App. 06/200,960
Airflow limiter and measurement device
Inventors:
Randy L. Buth, Robert A. Essig
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Oct 27, 1980
Inventors
Randy L. Buth
Robert A. Essig
Assignee (at issue)
McQuay-Perfex 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.