Granted Patent
Utility
US 4,253,208 · App. 06/063,903
Box spring assembly with basic wire grid
Inventors:
William L. Hancock, John P. Kitchen, Ned W. Mizelle
Patented Case
View Patent ↗
Granted: Mar 3, 1981
Filed: Aug 6, 1979
Inventors
William L. Hancock
John P. Kitchen
Ned W. Mizelle
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.