Granted Patent
Utility
US 4,978,151 · App. 07/394,886
Latch-operating mechanism for a panic egress device
Inventors:
Michael D. Coleman, Kerry W. Stadtfeld
Patented Case
View Patent ↗
Granted: Dec 18, 1990
Filed: Aug 17, 1989
Inventors
Michael D. Coleman
Kerry W. Stadtfeld
Assignee (at issue)
Von Duprin 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.