Granted Patent
Utility
US 4,307,141 · App. 06/174,858
Multi-ply fibrous sheet structure
Inventor:
Lawrence A. Walbrun
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Aug 4, 1980
Inventor
Lawrence A. Walbrun
Assignee (at issue)
American Can 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.