Granted Patent
Utility
US 5,950,668 · App. 08/935,764
Control valve positioners having improved operating characteristics
Inventor:
Hans D. Baumann
Patented Case
View Patent ↗
Granted: Sep 14, 1999
Filed: Sep 23, 1997
Inventor
Hans D. Baumann
Assignee (at issue)
Fisher Controls International LLC
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.