Granted Patent
Utility
US 4,699,355 · App. 06/667,297
Fail-safe fluid piloted valve positioner with hydromechanical position lock
Inventors:
Jerry B. Tomlin, Ronald L. Loup
Patented Case
View Patent ↗
Granted: Oct 13, 1987
Filed: Nov 1, 1984
Inventors
Jerry B. Tomlin
Ronald L. Loup
Assignee (at issue)
Koomey, Inc.
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.