Granted Patent
Utility
US 4,428,923 · App. 06/440,347
Continuous process for the production of hydrogen peroxide according to the anthraquinone process
Inventors:
Wolfgang Kunkel, Jorg Kemnade, Dietrich Schneider
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Nov 9, 1982
Inventors
Wolfgang Kunkel
Jorg Kemnade
Dietrich Schneider
Assignee (at issue)
Degussa AG
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.