Granted Patent
Utility
US 6,458,916 · App. 09/940,430
Production process and production apparatus for polybutylene terephthalate
Inventors:
Shuji Yamaguchi, Hidekazu Nakamoto, Susumu Harada, Norifumi Maeda
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Aug 29, 2001
Inventors
Shuji Yamaguchi
Hidekazu Nakamoto
Susumu Harada
Norifumi Maeda
Assignee (at issue)
HITACHI, 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.