Granted Patent
Utility
US 4,551,371 · App. 06/535,935
Multiple layer flexible sheet structure
Inventor:
John P. Eckstein
Patented Case
View Patent ↗
Granted: Nov 5, 1985
Filed: Nov 4, 1983
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.