Granted Patent
Utility
US 5,540,481 · App. 08/236,335
Chair with zero front rise control
Inventors:
Charles P. Roossien, Dale M. Groendal, James E. Massey, Robert Scheper, Douglas A. Smith, David C. Pugh
Patented Case
View Patent ↗
Granted: Jul 30, 1996
Filed: May 2, 1994
Inventors
Charles P. Roossien
Dale M. Groendal
James E. Massey
Robert Scheper
Douglas A. Smith
David C. Pugh
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.