Granted Patent
Utility
US 4,867,640 · App. 07/076,323
Exhaust fan for bathrooms and the like
Inventors:
Robert G. Penlesky, David W. Wolbrink, Kenneth J. Jonas, Thomas A. Kuhnke
Patented Case
View Patent ↗
Granted: Sep 19, 1989
Filed: Jul 22, 1987
Inventors
Robert G. Penlesky
David W. Wolbrink
Kenneth J. Jonas
Thomas A. Kuhnke
Assignee (at issue)
Broan Manufacturing Company, 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.