Granted Patent
Utility
US 4,913,773 · App. 07/313,322
Method of manufacture of paperboard
Inventors:
Keith W. Knudsen, Thomas J. Ziolkowski, William C. Bean
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Feb 17, 1989
Inventors
Keith W. Knudsen
Thomas J. Ziolkowski
William C. Bean
Assignee (at issue)
James River-Norwalk
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.