Granted Patent
Utility
US 4,500,381 · App. 06/486,788
Method and apparatus for making multiple ply paperboard
Inventor:
Duane M. Nordstrom
Patented Case
View Patent ↗
Granted: Feb 19, 1985
Filed: Apr 20, 1983
Inventor
Duane M. Nordstrom
Assignee (at issue)
Longview Fibre Company
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.