Granted Patent
Utility
US 4,770,944 · App. 06/538,106
Polymeric structure having improved barrier properties and method of making same
Inventors:
Christopher John Farrell, Boh C. Tsai, James A. Wachtel
Patented Case
View Patent ↗
Granted: Sep 13, 1988
Filed: Oct 3, 1983
Inventors
Christopher John Farrell
Boh C. Tsai
James A. Wachtel
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.