Granted Patent
Utility
US 5,482,595 · App. 08/215,983
Method for improving retention and drainage characteristics in alkaline papermaking
Inventors:
John C. Harrington, Michael Schuster
Patented Case
View Patent ↗
Granted: Jan 9, 1996
Filed: Mar 22, 1994
Inventors
John C. Harrington
Michael Schuster
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.