Granted Patent
Utility
US 4,952,914 · App. 07/420,979
Washer fluid monitor
Inventor:
Donald L. Mueller
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Oct 13, 1989
Inventor
Donald L. Mueller
Assignee (at issue)
General Motors LLC
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.