Granted Patent
Utility
US 4,237,932 · App. 06/057,287
Control arrangement for a damper
Inventor:
Gilbert H. Johnson
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Jul 13, 1979
Inventor
Gilbert H. Johnson
Assignee (at issue)
AMERICAN AIR FILTER COMPANY, 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.