Granted Patent
Utility
US 4,851,813 · App. 07/222,730
Combination back-up light and sound emitting device for automotive vehicle
Inventor:
Mark Gottlieb
Patented Case
View Patent ↗
Granted: Jul 25, 1989
Filed: Jul 22, 1988
Inventor
Mark Gottlieb
Assignee (at issue)
Designtech International, 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.