Granted Patent
Utility
US 5,806,930 · App. 08/819,850
Chair having back shell with selective stiffening
Inventor:
Glenn A. Knoblock
Patented Case
View Patent ↗
Granted: Sep 15, 1998
Filed: Mar 17, 1997
Inventor
Glenn A. Knoblock
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.