Granted Patent
Utility
US 5,270,444 · App. 08/032,169
Process for treatment of polyethylene terephthalate, polyethylene terephthalate for molding purposes and process for preparation thereof
Inventors:
Shigemi Shiraki, Yasuhiro Tanaka, Masayuki Sakai
Patented Case
View Patent ↗
Granted: Dec 14, 1993
Filed: Mar 12, 1993
Inventors
Shigemi Shiraki
Yasuhiro Tanaka
Masayuki Sakai
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.