Granted Patent
Utility
US 5,228,902 · App. 07/941,203
Method of desulfurization in vacuum processing of steel
Inventors:
Robert S. Bogan, Brad Hjerpe, Roger Marquart, James D. Reisinger
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Sep 3, 1992
Inventors
Robert S. Bogan
Brad Hjerpe
Roger Marquart
James D. Reisinger
Assignee (at issue)
USX 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.