Granted Patent
Utility
US 5,202,388 · App. 07/800,231
Process for producing hydrogenation product of ring-opening polymer
Inventors:
Akira Iio, Noboru Oshima, Yosihiro Ohira, Masao Sakamoto, Hiroshi Oka
Patented Case
View Patent ↗
Granted: Apr 13, 1993
Filed: Nov 29, 1991
Inventors
Akira Iio
Noboru Oshima
Yosihiro Ohira
Masao Sakamoto
Hiroshi Oka
Assignee (at issue)
Japan Synthetic Rubber 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.