Granted Patent
Utility
US 4,959,446 · App. 07/357,459
Polyamide with improved gas barrier properties from cyclo-alkylidene bisphenoxy diacetic acid
Inventors:
Burns Davis, Theodore R. Walker, Jr.
Patented Case
View Patent ↗
Granted: Sep 25, 1990
Filed: May 26, 1989
Inventors
Burns Davis
Theodore R. Walker, Jr.
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.