Granted Patent
Utility
US 3,990,121 · App. 05/614,719
Box spring assembly
Inventor:
James P. Whitaker
Patented Case
View Patent ↗
Granted: Nov 9, 1976
Filed: Sep 17, 1975
Inventor
James P. Whitaker
Assignee (at issue)
Lear Siegler, Inc.
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.