Granted Patent
Utility
US 4,704,752 · App. 06/834,903
Box spring assembly with modular twin continuous spring elements
Inventors:
Chester R. Yates, Maurice M. Bruner
Patented Case
View Patent ↗
Granted: Nov 10, 1987
Filed: Feb 28, 1986
Inventors
Chester R. Yates
Maurice M. Bruner
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.