Granted Patent
Utility
US 4,841,012 · App. 07/236,382
Polyesters with improved gas barrier properties
Inventor:
Robert B. Barbee
Patented Case
View Patent ↗
Granted: Jun 20, 1989
Filed: Aug 25, 1988
Inventor
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.