Granted Patent
Utility
US 5,579,800 · App. 08/270,509
Rotary valve position indicator and method
Inventor:
Daniel Walker
Patented Case
View Patent ↗
Granted: Dec 3, 1996
Filed: Jul 5, 1994
Inventor
Daniel Walker
Assignee (at issue)
Keystone International
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.