Granted Patent
Utility
US 4,891,853 · App. 07/264,024
Box spring assembly
Inventor:
Upton R. Dabney
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Oct 28, 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.