Granted Patent
Utility
US 5,241,046 · App. 07/835,077
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: Aug 31, 1993
Filed: Feb 18, 1992
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.