Granted Patent
Utility
US 5,532,308 · App. 08/373,706
Method for improving retention and drainage characteristics in alkaline papermaking
Inventors:
Michael Schuster, John C. Harrington, Wen P. Liao, Fu Chen
Patented Case
View Patent ↗
Granted: Jul 2, 1996
Filed: Jan 17, 1995
Inventors
Michael Schuster
John C. Harrington
Wen P. Liao
Fu Chen
Assignee (at issue)
Betz PaperChem 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.