Granted Patent
Utility
US 4,765,867 · App. 06/881,379
Pitch control process utilizing quaternized polyamine ionene polymer
Inventors:
David D. Dreisbach, Gilbert S. Gomes, Michael Schuster
Patented Case
View Patent ↗
Granted: Aug 23, 1988
Filed: Jul 2, 1986
Inventors
David D. Dreisbach
Gilbert S. Gomes
Michael Schuster
Assignee (at issue)
Betz Laboratories, 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.