Granted Patent
Utility
US 4,310,383 · App. 06/205,848
Continuous countercurrent pretreatment of lignocellulose with anthraquinone prior to pulping
Inventors:
John S. Fujii, William G. Whalley, Fred L. Schmidt
Patented Case
View Patent ↗
Granted: Jan 12, 1982
Filed: Nov 10, 1980
Inventors
John S. Fujii
William G. Whalley
Fred L. Schmidt
Assignee (at issue)
Crown Zellerbach 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.