Granted Patent
Utility
US 4,412,813 · App. 06/345,031
Rotary hearth furnace and method of loading and unloading the furnace
Inventor:
Karl A. Wulf
Patented Case
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Granted: Nov 1, 1983
Filed: Feb 2, 1982
Inventor
Karl A. Wulf
Assignee (at issue)
Alco Standard 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.