Granted Patent
Utility
US 4,452,438 · App. 06/344,112
Box spring assembly with improved corner springs
Inventors:
William L. Hancock, Wilbur Carl Bewley, JR.
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Jan 29, 1982
Inventors
William L. Hancock
Wilbur Carl Bewley, JR.
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.