Granted Patent
Utility
US 6,325,893 · App. 09/436,342
Alkaline paper surface sizing agents, method of use and surface sized paper
Inventors:
Clement L. Brungardt, Richard J. Riehle, Jian Zhang
Patented Case
View Patent ↗
Granted: Dec 4, 2001
Filed: Nov 8, 1999
Inventors
Clement L. Brungardt
Richard J. Riehle
Jian Zhang
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.