Granted Patent
Utility
US 6,273,997 · App. 09/617,359
Rosin/hydrocarbon resin size for paper
Inventors:
Susan M. Ehrhardt, D. Bruce Evans
Patented Case
View Patent ↗
Granted: Aug 14, 2001
Filed: Jul 17, 2000
Inventors
Susan M. Ehrhardt
D. Bruce Evans
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.