Granted Patent
Utility
US 4,173,047 · App. 05/904,040
Tubular border frame for inner spring assemblies
Inventor:
John W. Schaefer
Patented Case
View Patent ↗
Granted: Nov 6, 1979
Filed: May 8, 1978
Inventor
John W. Schaefer
Assignee (at issue)
Nachman Corporation
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.