Granted Patent
Utility
US 4,730,358 · App. 07/030,461
Sinuous spring module box spring assembly
Inventor:
Henry Zapletal
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Mar 25, 1987
Inventor
Henry Zapletal
Assignee (at issue)
LEGGETT & PLATT, 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.