Granted Patent
Utility
US 4,726,613 · App. 06/835,511
Fire safety door latch
Inventor:
William R. Foshee
Patented Case
View Patent ↗
Granted: Feb 23, 1988
Filed: Mar 3, 1986
Inventor
William R. Foshee
Assignee (at issue)
Best Lock Corporation
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.