Granted Patent
Utility
US 6,289,693 · App. 09/463,535
Cryogenic and membrane synthesis gas production
Inventor:
John V. O'Brien
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Jan 25, 2000
Inventor
John V. O'Brien
Assignee (at issue)
Chart Industries, 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.