Granted Patent
Utility
US 5,229,033 · App. 07/651,160
Polybutene based foam control compositions for aqueous systems
Inventors:
Duy T. Nguyen, Mitzi K. Fader, William A. Hendriks
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Feb 6, 1991
Inventors
Duy T. Nguyen
Mitzi K. Fader
William A. Hendriks
Assignee (at issue)
Betz PaperChem 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.