Granted Patent
Utility
US 5,921,911 · App. 08/932,138
Methods of inhibiting foam formation in alkanolamine systems
Inventor:
Paul R. Hart
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Sep 16, 1997
Inventor
Paul R. Hart
Assignee (at issue)
Betzdearborn, 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.