Granted Patent
Utility
US 4,290,453 · App. 06/044,179
Reversing valve construction and method of making the same
Inventor:
Werner Bauer
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: May 31, 1979
Inventor
Werner Bauer
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.