Granted Patent
Utility
US 6,649,699 · App. 09/993,172
Fluoropolymer compositions with improved gas impermeability
Inventor:
Shinichi Namura
Patented Case
View Patent ↗
Granted: Nov 18, 2003
Filed: Nov 16, 2001
Inventor
Shinichi Namura
Assignee (at issue)
DU PONT-MITSUI FLUOROCHEMICALS CO., LTD.
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.