Granted Patent
Utility
US 4,299,653 · App. 06/098,524
Method of bleaching pulp with an aqueous solution of chlorine dioxide and chlorine followed by a chlorine solution
Inventor:
Douglas W. Reeve
Patented Case
View Patent ↗
Granted: Nov 10, 1981
Filed: Nov 29, 1979
Inventor
Douglas W. Reeve
Assignee (at issue)
ERCO Industries Limited
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.