Granted Patent
Utility
US 5,709,009 · App. 08/690,403
Door closer for the non-fire side of a fire-door safety installation
Inventors:
Rex H. Lasson, William L. Downey, Roderick A. L. Ross
Patented Case
View Patent ↗
Granted: Jan 20, 1998
Filed: Jul 25, 1996
Inventors
Rex H. Lasson
William L. Downey
Roderick A. L. Ross
Assignee (at issue)
Schlage Lock Company 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.