Granted Patent
Utility
US 5,733,502 · App. 08/882,253
Ferroalloy for inoculation of spherulitic graphite irons
Inventors:
Thomas Margaria, Robert A. Herold
Patented Case
View Patent ↗
Granted: Mar 31, 1998
Filed: Jun 25, 1997
Inventors
Thomas Margaria
Robert A. Herold
Assignee (at issue)
Pechiney Electrometallurgie
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.