Granted Patent
Utility
US 5,227,610 · App. 07/731,772
Process and device for indicating an anomalous thermal stress condition in a heating surface made from glass ceramic or a comparable material
Inventors:
Bernd Schultheis, Klaus Kristen
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jul 18, 1991
Inventors
Bernd Schultheis
Klaus Kristen
Assignee (at issue)
Schott Glaswerke
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.