Granted Patent
Utility
US 4,846,933 · App. 07/157,445
Process for controlling pitch deposition from pulp in papermaking systems
Inventors:
David D. Dreisbach, Gilbert S. Gomes
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Feb 17, 1988
Inventors
David D. Dreisbach
Gilbert S. Gomes
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.