Granted Patent
Utility
US 4,131,961 · App. 05/824,340
Formed wire box spring with wire grid unit
Inventor:
John P. Kitchen
Patented Case
View Patent ↗
Granted: Jan 2, 1979
Filed: Aug 15, 1977
Inventor
John P. Kitchen
Assignee (at issue)
Hoover Universal, 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.