Granted Patent
Utility
US 6,744,022 · App. 09/968,109
Systems and methods for monitoring or controlling the ratio of hydrogen to water vapor in metal heat treating atmospheres
Inventors:
Robert N. Blumenthal, Andreas T. Melville
Patented Case
View Patent ↗
Granted: Jun 1, 2004
Filed: Oct 1, 2001
Inventors
Robert N. Blumenthal
Andreas T. Melville
Assignee (at issue)
Furnace Control Corp.
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.