Granted Patent
Utility
US 5,053,281 · App. 07/544,635
Aromatic polyamide and gas-barrier property imparting agent composed of it
Inventors:
Takeshi Sakashita, Tomoaki Shimoda
Patented Case
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Granted: Oct 1, 1991
Filed: Jun 27, 1990
Inventors
Takeshi Sakashita
Tomoaki Shimoda
Assignee (at issue)
Mitsui Petrochemical Industries, 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.