Granted Patent
Utility
US 4,867,424 · App. 07/248,048
Box spring with wire columns and partial coils
Inventor:
Upton R. Dabney
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Sep 23, 1988
Inventor
Upton R. Dabney
Assignee (at issue)
Hoover Limited
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.