Granted Patent
Utility
US 4,807,718 · App. 07/163,397
Acoustic noise control for fans
Inventor:
Robert LOTZ
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Mar 2, 1988
Inventor
Robert LOTZ
Assignee (at issue)
Digital Equipment Corporation
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.