Granted Patent
Utility
US 4,640,973 · App. 06/785,132
Polyamide resin capable of forming containers having improved gas barrier properties from phenylene dioxy diacetic acid and naphthalene dicarboxylic acid
Inventors:
Burns Davis, Robert B. Barbee
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Oct 7, 1985
Inventors
Burns Davis
Robert B. Barbee
Assignee (at issue)
EASTMAN KODAK 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.