Granted Patent
Utility
US 6,254,840 · App. 09/266,810
Gas-liquid contacting apparatus
Inventor:
Johannes Henricus Mennen
Patented Case
View Patent ↗
Granted: Jul 3, 2001
Filed: Mar 12, 1999
Inventor
Johannes Henricus Mennen
Assignee (at issue)
DSM N.V.
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.