Granted Patent
Utility
US 5,529,662 · App. 08/267,947
Method of bleaching cellulosic pulps with ozone and a protective amount of an N-alkylated urea
Inventors:
Zheng Tan, Marco Solinas
Patented Case
View Patent ↗
Granted: Jun 25, 1996
Filed: Jul 6, 1994
Inventors
Zheng Tan
Marco Solinas
Assignee (at issue)
MacMillan Bloedel 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.