Granted Patent
Utility
US 4,363,697 · App. 06/099,684
Method for medium consistency oxygen delignification of pulp
Inventors:
Larry D. Markham, Henrik Eklund
Patented Case
View Patent ↗
Granted: Dec 14, 1982
Filed: Dec 3, 1979
Inventors
Larry D. Markham
Henrik Eklund
Assignees (at issue)
Black Clawson Company, Inc.
Air Products and Chemicals, Inc.
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.