Granted Patent
Utility
US 3,975,995 · App. 05/557,979
Ventilated ceiling construction
Inventor:
Bernard R. Shuler
Patented Case
View Patent ↗
Granted: Aug 24, 1976
Filed: Mar 13, 1975
Inventor
Bernard R. Shuler
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.