Granted Patent
Utility
US 4,418,841 · App. 06/306,675
Multiple layer flexible sheet structure
Inventor:
John P. Eckstein
Patented Case
View Patent ↗
Granted: Dec 6, 1983
Filed: Sep 29, 1981
Inventor
John P. Eckstein
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.