Granted Patent
Utility
US 5,658,026 · App. 08/523,714
Door handle locking mechanism with dual function springs
Inventors:
Daniel N. Nigro, Jr., Theodore J. Fritsch
Patented Case
View Patent ↗
Granted: Aug 19, 1997
Filed: Sep 5, 1995
Inventors
Daniel N. Nigro, Jr.
Theodore J. Fritsch
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.