Granted Patent
Utility
US 4,816,342 · App. 06/916,272
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: Mar 28, 1989
Filed: Dec 11, 1986
Inventors
Christopher John Farrell
Boh C. Tsai
James A. Wachtel
Assignee (at issue)
American National 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.