Granted Patent
Utility
US 5,908,892 · App. 08/932,137
N, N-alkyl polyacrylamide metal treatment
Inventors:
Jiangbo Ouyang, Jen-Chi Chen
Patented Case
View Patent ↗
Granted: Jun 1, 1999
Filed: Sep 16, 1997
Inventors
Jiangbo Ouyang
Jen-Chi Chen
Assignee (at issue)
Betzdearborn, 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.