Granted Patent
Utility
US 5,571,377 · App. 08/244,637
Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel
Inventors:
Petter Tibbling, Ulla Ekstroom, Erik Nilsson, Lars-Ove Larsson
Patented Case
View Patent ↗
Granted: Nov 5, 1996
Filed: Jun 7, 1994
Inventors
Petter Tibbling
Ulla Ekstroom
Erik Nilsson
Lars-Ove Larsson
Assignee (at issue)
Kvaerner Pulping Technologies AB
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.