Granted Patent
Utility
US 5,891,304 · App. 08/681,029
Use of hydrophilic dispersion polymers for coated broke treatment
Inventor:
Jane B. Wong Shing
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: Jul 22, 1996
Inventor
Jane B. Wong Shing
Assignee (at issue)
Nalco Chemical Company
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.