Granted Patent
Utility
US 4,510,851 · App. 06/584,307
Ventilation fan
Inventors:
Joseph R. Sarnosky, David W. Wolbrink, Dieter W. Otte
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Mar 5, 1984
Inventors
Joseph R. Sarnosky
David W. Wolbrink
Dieter W. Otte
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.