Granted Patent
Utility
US 4,869,312 · App. 06/898,826
Casting in an exothermic reduction atmosphere
Inventors:
Howard H. Liebermann, John A. Wellslager, Lance A. Davis
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: Aug 20, 1986
Inventors
Howard H. Liebermann
John A. Wellslager
Lance A. Davis
Assignee (at issue)
ALLIED CONSULTING, 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.