Granted Patent
Utility
US 5,425,899 · App. 08/212,418
Use of foam control composition in aqueous systems
Inventors:
Duy T. Nguyen, Charles J. Berzansky, Jr.
Patented Case
View Patent ↗
Granted: Jun 20, 1995
Filed: Mar 11, 1994
Inventors
Duy T. Nguyen
Charles J. Berzansky, Jr.
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.