Granted Patent
Utility
US 6,263,541 · App. 09/234,616
Winding cone of an overhead door counterbalancing mechanism and torsion spring winding method therefor
Inventor:
John E. Scates
Patented Case
View Patent ↗
Granted: Jul 24, 2001
Filed: Jan 21, 1999
Inventor
John E. Scates
Assignee (at issue)
Windsor Door, Inc.
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.