Granted Patent
Utility
US 5,997,087 · App. 09/143,130
Chair tilt mechanism
Inventor:
William S. Stumpf
Patented Case
View Patent ↗
Granted: Dec 7, 1999
Filed: Aug 28, 1998
Inventor
William S. Stumpf
Assignee (at issue)
Northfield Metal Products Limited
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.