Granted Patent
Utility
US 5,846,436 · App. 08/801,401
Composition and method for water clarification
Inventors:
Jen-Chi Chen, Fu Chen, Gerald C. Walterick, Jr., Stephen R. Vasconcellos
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: Feb 20, 1997
Inventors
Jen-Chi Chen
Fu Chen
Gerald C. Walterick, Jr.
Stephen R. Vasconcellos
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.