Granted Patent
Utility
US 6,168,686 · App. 09/152,695
Papermaking aid
Inventors:
Frank J. Sutman, Richard A. Hobirk
Patented Case
View Patent ↗
Granted: Jan 2, 2001
Filed: Aug 19, 1998
Inventors
Frank J. Sutman
Richard A. Hobirk
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.