Granted Patent
Utility
US 5,253,185 · App. 07/647,915
Valve diagnostic system including auxiliary transducer box
Inventors:
John H. Mutchler, William D. Marriott
Patented Case
View Patent ↗
Granted: Oct 12, 1993
Filed: Jan 30, 1991
Inventors
John H. Mutchler
William D. Marriott
Assignee (at issue)
Combustion Engineering, 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.