Granted Patent
Utility
US 4,470,239 · App. 06/214,250
Suspended ceiling grid system
Inventor:
Gale E. Sauer
Patented Case
View Patent ↗
Granted: Sep 11, 1984
Filed: Dec 8, 1980
Inventor
Gale E. Sauer
Assignee (at issue)
Donn Incorporated
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.