Granted Patent
Utility
US 5,085,475 · App. 07/709,167
Exit-delaying mechanism, for a panic exit device
Inventors:
Marlin Austin, Michael L. Cain, Paul J. Haeck
Patented Case
View Patent ↗
Granted: Feb 4, 1992
Filed: Jun 3, 1991
Inventors
Marlin Austin
Michael L. Cain
Paul J. Haeck
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.