Granted Patent
Utility
US 4,020,512 · App. 05/610,669
Bed assembly
Inventor:
William L. Pringle
Patented Case
View Patent ↗
Granted: May 3, 1977
Filed: Sep 5, 1975
Inventor
William L. Pringle
Assignee (at issue)
United States Steel 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.