Granted Patent
Utility
US 4,483,891 · App. 06/539,495
Multilayered tube having a barrier layer
Inventor:
Daryl D. Cerny
Patented Case
View Patent ↗
Granted: Nov 20, 1984
Filed: Oct 6, 1983
Inventor
Daryl D. Cerny
Assignee (at issue)
BALL CORPORATION
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.