Granted Patent
Utility
US 4,473,439 · App. 06/410,830
Process for pulping lignocellulosic material
Inventors:
Isao Wada, Jun-Ichiro Kido, Wazuo Koido
Patented Case
View Patent ↗
Granted: Sep 25, 1984
Filed: Aug 23, 1982
Inventors
Isao Wada
Jun-Ichiro Kido
Wazuo Koido
Assignee (at issue)
Oji Paper Co., 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.