Granted Patent
Utility
US 4,989,640 · App. 07/285,824
Diverter valve
Inventors:
Rudolf Steffes, Harald Meyer
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Dec 16, 1988
Inventors
Rudolf Steffes
Harald Meyer
Assignee (at issue)
American Standard 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.