Granted Patent
Utility
US 4,239,181 · App. 05/908,209
Valve positioner and method of making the same
Inventor:
Harold G. Brakebill
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: May 22, 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.