Granted Patent
Utility
US 6,667,029 · App. 09/781,505
Stable, aqueous cationic hydrogel
Inventors:
Yuanzhen Zhong, Janusz Jachowicz, Philip F. Wolf, Roger Mc Mullen
Patented Case
View Patent ↗
Granted: Dec 23, 2003
Filed: Jan 12, 2001
Inventors
Yuanzhen Zhong
Janusz Jachowicz
Philip F. Wolf
Roger Mc Mullen
Assignee (at issue)
ISP INVESTMENTS LLC
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.