Granted Patent
Utility
US 4,689,736 · App. 06/614,176
Distributed process control system
Inventors:
Stephen P. Glaudel, Paul H. Grissom
Patented Case
View Patent ↗
Granted: Aug 25, 1987
Filed: May 29, 1984
Inventors
Stephen P. Glaudel
Paul H. Grissom
Assignee (at issue)
Federal Signal Corporation
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.