Granted Patent
Utility
US 5,572,828 · App. 08/387,455
Pin lock for tilt sash lock shoe
Inventor:
Norman R. Westfall
Patented Case
View Patent ↗
Granted: Nov 12, 1996
Filed: Feb 13, 1995
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.