Granted Patent
Utility
US 6,715,236 · App. 09/948,086
Anti-drop device for vertically moving door
Inventor:
Willis Jay Mullet
Patented Case
View Patent ↗
Granted: Apr 6, 2004
Filed: Sep 6, 2001
Inventor
Willis Jay Mullet
Assignee (at issue)
Wayne-Dalton Corp.
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.