Granted Patent
Utility
US 5,283,002 · App. 07/775,673
Antifoam/defoamer composition and method of use thereof in aqueous systems
Inventor:
Duy T. Nguyen
Patented Case
View Patent ↗
Granted: Feb 1, 1994
Filed: Oct 11, 1991
Inventor
Duy T. Nguyen
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.