Granted Patent
Utility
US 4,570,895 · App. 06/384,647
Chair control tension adjustment assembly
Inventors:
Ronald L. Whitwam, Charles C. Pergler
Patented Case
View Patent ↗
Granted: Feb 18, 1986
Filed: Jun 3, 1982
Inventors
Ronald L. Whitwam
Charles C. Pergler
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.