Granted Patent
Utility
US 4,292,720 · App. 06/100,729
Method of making reversing valve construction and parts therefor
Inventor:
Werner Bauer
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: Dec 6, 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.