Granted Patent
Utility
US 6,149,766 · App. 08/740,832
Process for peroxide bleaching of chemical pulp in a pressurized bleaching vessel
Inventors:
Petter Tibbling, Ulla Ekstrom, Erik Nilsson, Lars-Ove Larsson
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Nov 4, 1996
Inventors
Petter Tibbling
Ulla Ekstrom
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.