Granted Patent
Utility
US 4,755,220 · App. 07/117,329
Materials resistant to metal and salt melts, their production and their use
Inventors:
Peter Woditsch, Werner Kannchen, Horst Lange, Ingo Schwirtlich
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: Nov 6, 1987
Inventors
Peter Woditsch
Werner Kannchen
Horst Lange
Ingo Schwirtlich
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.