Granted Patent
Utility
US 4,861,429 · App. 07/225,978
Process for inhibiting white pitch deposition in papermaking felts
Inventors:
Daniel Joseph Barnett, Daniel L. Michalopoulos
Patented Case
View Patent ↗
Granted: Aug 29, 1989
Filed: Jul 29, 1988
Inventors
Daniel Joseph Barnett
Daniel L. Michalopoulos
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.