Granted Patent
Utility
US 6,640,496 · App. 10/104,465
Anti-drop device
Inventor:
Willis Jay Mullet
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Mar 21, 2002
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.