Granted Patent
Utility
US 4,218,040 · App. 05/941,464
Valve positioner and method of making same
Inventor:
Harold G. Brakebill
Patented Case
View Patent ↗
Granted: Aug 19, 1980
Filed: Sep 12, 1978
Inventor
Harold G. Brakebill
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.