Granted Patent
Utility
US 4,279,643 · App. 06/138,861
Magnesium bearing compositions for and method of steel desulfurization
Inventor:
Joseph R. Jackman
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Apr 8, 1980
Inventor
Joseph R. Jackman
Assignee (at issue)
Reactive Metals & Alloys 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.