Granted Patent
Utility
US 5,230,221 · App. 07/532,689
Chilling door for vacuum tumblers and massagers
Inventor:
David Delich
Patented Case
View Patent ↗
Granted: Jul 27, 1993
Filed: Jun 4, 1990
Inventor
David Delich
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.