Granted Patent
Utility
US 3,977,029 · App. 05/506,946
Box spring assembly with coated wire components
Inventor:
William L. Hancock
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Sep 18, 1974
Inventor
William L. Hancock
Assignee (at issue)
Hoover Ball and Bearing Company
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.