Granted Patent
Utility
US 5,463,793 · App. 08/280,491
Sash shoe system for curl spring window balance
Inventor:
Norman R. Westfall
Patented Case
View Patent ↗
Granted: Nov 7, 1995
Filed: Jul 26, 1994
Inventor
Norman R. Westfall
Assignee (at issue)
CALDWELL MANUFACTURING COMPANY
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.