Granted Patent
Utility
US 6,108,489 · App. 09/268,225
Food warning device containing a rechargeable phase change material
Inventors:
Sigurd Frohlich, Hans Jochen Koellner, Ival O. Salyer
Patented Case
View Patent ↗
Granted: Aug 22, 2000
Filed: Mar 15, 1999
Inventors
Sigurd Frohlich
Hans Jochen Koellner
Ival O. Salyer
Assignee (at issue)
Phase Change Laboratories, Inc.
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.