Granted Patent
Utility
US 4,402,706 · App. 06/333,143
Method and apparatus for oxidizing dried low rank coal
Inventor:
Donald K. Wunderlich
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Dec 21, 1981
Inventor
Donald K. Wunderlich
Assignee (at issue)
Atlantic Richfield Company
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.