Granted Patent
Utility
US 5,256,363 · App. 07/985,752
Polyethylene terephthalate and uses thereof
Inventors:
Mikio Hashimoto, Hiroji Niimi, Tadao Yatsu, Shigemi Shiraki
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Dec 4, 1992
Inventors
Mikio Hashimoto
Hiroji Niimi
Tadao Yatsu
Shigemi Shiraki
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.