Granted Patent
Utility
US 4,472,471 · App. 06/343,113
Chair mat
Inventors:
William G. Klein, Bernard Brenner
Patented Case
View Patent ↗
Granted: Sep 18, 1984
Filed: Jan 27, 1982
Inventors
William G. Klein
Bernard Brenner
Assignee (at issue)
United Technical Products, 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.