Granted Patent
Utility
US 5,419,010 · App. 08/056,190
Compact counterbalancing system for sectional doors
Inventor:
Willis Jay Mullet
Patented Case
View Patent ↗
Granted: May 30, 1995
Filed: May 3, 1993
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.