Granted Patent
Utility
US 4,435,249 · App. 06/325,084
Process for the oxygen delignification of pulp mill rejects
Inventors:
Larry D. Markham, Andrew Martin, Edward F. Elton, Vincent L. Magnotta, Scott A. Wallick
Patented Case
View Patent ↗
Granted: Mar 6, 1984
Filed: Nov 25, 1981
Inventors
Larry D. Markham
Andrew Martin
Edward F. Elton
Vincent L. Magnotta
Scott A. Wallick
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.