Granted Patent
Utility
US 5,444,144 · App. 08/292,763
Process for producing polyethylene terephthalate
Inventors:
Katsuji Tanaka, Kazuyoshi Mino, Yuka Nakazima
Patented Case
View Patent ↗
Granted: Aug 22, 1995
Filed: Sep 19, 1994
Inventors
Katsuji Tanaka
Kazuyoshi Mino
Yuka Nakazima
Assignee (at issue)
MITSUBISHI CHEMICAL CORPORATION
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.