Granted Patent
Utility
US 5,628,490 · App. 08/544,658
Control valve with pneumatic actuation
Inventors:
Daniel Henry Roberts, Vincent J. Boreas, Charles A. Palmer
Patented Case
View Patent ↗
Granted: May 13, 1997
Filed: Oct 18, 1995
Inventors
Daniel Henry Roberts
Vincent J. Boreas
Charles A. Palmer
Assignee (at issue)
METCRAFT, 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.