Granted Patent
Utility
US 4,274,913 · App. 06/041,505
Process for producing alkali pulp
Inventors:
Makoto Kikuiri, Yoshimi Nakashio, Yasue Arai, Toshio Hidaka
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: May 22, 1979
Inventors
Makoto Kikuiri
Yoshimi Nakashio
Yasue Arai
Toshio Hidaka
Assignee (at issue)
Toyo Pulp 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.