Granted Patent
Utility
US 4,436,615 · App. 06/493,118
Process for removing solids from coal tar
Inventors:
Norman S. Boodman, Elvin L. Farr, Robert J. Osterholm, Neulan B. Green, III
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: May 9, 1983
Inventors
Norman S. Boodman
Elvin L. Farr
Robert J. Osterholm
Neulan B. Green, III
Assignee (at issue)
United States Steel Corporation
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.