Granted Patent
Utility
US 5,612,489 · App. 08/601,627
Enhanced sensitivity for oxygen and other interactive gases in sample gases using gas chromatography
Inventors:
Daniel James Ragsdale, George H. Smudde, Jr., David A. Zatko
Patented Case
View Patent ↗
Granted: Mar 18, 1997
Filed: Feb 14, 1996
Inventors
Daniel James Ragsdale
George H. Smudde, Jr.
David A. Zatko
Assignee (at issue)
Air Products and Chemicals, 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.