Refrigeration – Using electrical or magnetic effect – Thermoelectric; e.g. – peltier effect
Reexamination Certificate
2000-07-18
2001-10-09
Bennett, Henry (Department: 3744)
Refrigeration
Using electrical or magnetic effect
Thermoelectric; e.g., peltier effect
C062S003620, C062S340000
Reexamination Certificate
active
06298668
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to ice cream machines. More particularly, this invention relates to an ice cream machine that uses a semiconductor refrigerator.
2. Description of the Related Art
Conventional ice cream machines do not use a semiconductor refrigerator as a cooling source. Ice cream machines typically have used ice/salt mixtures or conventional Chloro-Fluoro-Carbon (CFC) based refrigeration units to provide the cooling needed to freeze ice cream. Ice/salt machines are messy and seldom achieve the cold temperatures needed to properly freeze ice cream. CFC based units have a tendency to be bulky and expensive. CFC based units also have the disadvantage of containing pollution causing chemical refrigerants. Semiconductor refrigerator technology has now developed to an extent that semiconductor refrigeration can be used to form a small volume, high efficiency ice cream maker that does not require use of pollution causing refrigerants.
SUMMARY OF THE INVENTION
A preferred embodiment of an ice cream maker in accordance with the present invention includes a three part casing shell, a refrigeration plate, a heat radiator, a cold container, a motor and a stirring shaft. The refrigeration plate abuts tightly to the bottom of the cold container for maximum heat transference. The heat radiator is positioned below the refrigeration plate to remove heat from the refrigeration unit. The stirring shaft is positioned in the cold container for stirring the ice cream mixture during the freezing process. The motor drives the stirring shaft.
The refrigeration plate employs P-N junction semiconductor refrigeration technology to provide a compact, highly efficient ice cream maker containing no CFC pollutants.
An object of the invention is to provide an ice cream machine using a semiconductor refrigerator.
These and other objects, features and advantages of the invention will become readily apparent to those skilled in the art upon reading the description of the preferred embodiments, in conjunction with the accompanying drawings.
REFERENCES:
patent: 4441334 (1984-04-01), Cipelletti
patent: 4891949 (1990-01-01), Caldarola
patent: 5016446 (1991-05-01), Fiedler
patent: 6041614 (2000-03-01), Yamaya et al.
Alix Yale & Ristas, LLP
Bennett Henry
Front Direction Industrial Ltd.
Jones Melvin
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