Granted Patent
Utility
US 5,912,306 · App. 08/754,355
Cationic compounds useful as drainage aids and stabilizers for rosin-based sizing agents
Inventors:
Ian A. Pudney, Brian M. Stubbs, Malcolm J. Welch
Patented Case
View Patent ↗
Granted: Jun 15, 1999
Filed: Nov 22, 1996
Inventors
Ian A. Pudney
Brian M. Stubbs
Malcolm J. Welch
Assignee (at issue)
HERCULES LLC
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.