Granted Patent
Utility
US 4,805,883 · App. 07/083,353
Box spring assembly with a grid structure formed of both basic and spring wire
Inventor:
John P. Kitchen
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Aug 10, 1987
Inventor
John P. Kitchen
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.