Granted Patent
Utility
US 4,894,119 · App. 06/721,876
Retention and/or drainage and/or dewatering aid
Inventors:
Joseph J. Baron, Jr., Tamara Nowakowski, Thomas Farrington, Frederick R. Mahn
Patented Case
View Patent ↗
Granted: Jan 16, 1990
Filed: Apr 10, 1985
Inventors
Joseph J. Baron, Jr.
Tamara Nowakowski
Thomas Farrington
Frederick R. Mahn
Assignee (at issue)
Drew Chemical Corporation
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.