Granted Patent
Utility
US 5,013,393 · App. 07/517,235
Process for the melting and directional solidification of metals
Inventors:
Ingo Schwirtlich, Peter Woditsch
Patented Case
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Granted: May 7, 1991
Filed: May 1, 1990
Inventors
Ingo Schwirtlich
Peter Woditsch
Assignee (at issue)
Bayer Aktiengesellschaft
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.