Granted Patent
Utility
US 5,884,006 · App. 08/954,318
Rechargeable phase change material unit and food warming device
Inventors:
Sigurd Frohlich, Hans Jochen Koellner
Patented Case
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Granted: Mar 16, 1999
Filed: Oct 17, 1997
Inventors
Sigurd Frohlich
Hans Jochen Koellner
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.