Granted Patent
Utility
US 5,034,095 · App. 07/466,113
Apparatus and process for the delignification of cellulose pulp
Inventors:
Junichiro Kido, Hajime Yamanaka, Masaru Hirasawa, Keiichi Tsuchiya
Patented Case
View Patent ↗
Granted: Jul 23, 1991
Filed: Jan 16, 1990
Inventors
Junichiro Kido
Hajime Yamanaka
Masaru Hirasawa
Keiichi Tsuchiya
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.