Granted Patent
Utility
US 4,519,651 · App. 06/434,239
Convertible inner shell for seating and the like
Inventor:
Ronald L. Whitwam
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Oct 14, 1982
Inventor
Ronald L. Whitwam
Assignee (at issue)
Steelcase 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.