Granted Patent
Utility
US 6,440,327 · App. 09/774,413
Polymers and use thereof as scale inhibitors
Inventors:
Sergey M. Shevchenko, Prasad Y. Duggirala
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Jan 31, 2001
Inventors
Sergey M. Shevchenko
Prasad Y. Duggirala
Assignee (at issue)
Ondeo Nalco 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.