Granted Patent
Utility
US 5,214,952 · App. 07/745,697
Calibration for ultra high purity gas analysis
Inventors:
Gregory H. Leggett, Michael H. Sonricker
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Aug 16, 1991
Inventors
Gregory H. Leggett
Michael H. Sonricker
Assignee (at issue)
Praxair Technology, 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.