Granted Patent
Utility
US 4,510,635 · App. 06/504,371
Box spring assemblies
Inventor:
Arnold Woffendin
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Jun 14, 1983
Inventor
Arnold Woffendin
Assignee (at issue)
Silentnight Holdings PLC
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.