Device and method for mixing viscous substances

1. A system comprising:

a container mount;

a container configured to hold ingredients and to temporally attached to the container mount;

a liquid nitrogen dosing system configured to provide a controlled amount of liquid nitrogen to the ingredients in the container such that the ingredients freeze; and

beaters configured to mix the ingredients in the container and configured to be self-clearing to each other and clean the sides and bottom of the container, the beaters being disposed to pass within 1/16 th of an inch of each other without contacting each other, the self-cleaning being sufficient to remove the frozen ingredients from the interlocking beaters.

2. The system of claim 1 , further comprising a second motor configured to rotate the interlocking beaters.

3. The system of claim 1 , further comprising a temperature sensor configured to measure a cooling of the ingredients.

4. The system of claim 3 , wherein the temperature sensor includes a thermal couple disposed not to come in contact with the ingredients.

5. The system of claim 3 , further comprising a circuit configured to control the dosing system in response to the temperature sensor.

6. The system of claim 5 , wherein the circuit includes an input configured for a user to select a hardness of the frozen ingredients and to control the dosing system in response to the selection.

7. The system of claim 1 , further comprising a viscosity sensor configured to measure a viscosity of the ingredients.

8. The system of claim 7 , wherein the viscosity sensor includes a torque or current sensor.

9. The system of claim 1 , wherein the interlocking beaters are further configured to clean the frozen ingredients from a surface of the container.

10. The system of claim 1 , wherein the interlocking beaters are disposed to pass within less than ⅛ th of an inch of a side of the container.

11. The system of claim 1 , wherein the interlocking beaters are helical.

12. The system of claim 1 , wherein a first of the beaters is disposed closer to a side of the container relative to a second of the beaters and the motor is configured to rotate the container mount in a direction opposite a rotation of the first beater.

13. The system of claim 1 , wherein the container mount includes a spindle.

14. The system of claim 1 , wherein the beaters are interlocking.

15. The system of claim 1 , further comprising a first motor configured to rotate the container mount.

16. The system of claim 1 , wherein the beaters are configured to pass within ⅛ th inch of all of a bottom of the container and thereby remove the frozen ingredients from the bottom of the container.

17. A method of making ice cream, the method comprising:

placing ingredients in a container;

mixing the ingredients using at least two interlocking beaters disposed such that the interlocking beaters are within ⅛ th of an inch of each other but do not touch each other;

rotating the container in a direction opposite a rotation of a member of the beaters closest to a side of the container;

freezing the ingredients during the steps of mixing and rotating by adding a controlled amount of a coolant to the ingredients, and

measuring viscosity of the ingredients and controlling delivery of the coolant to the ingredients responsive to the measured viscosity.

18. A method of making ice cream, the method comprising:

placing ingredients in a container;

mixing the ingredients using at least two interlocking beaters disposed such that the interlocking beaters are within ⅛ th of an inch of each other but do not touch each other;

rotating the container in a direction opposite a rotation of a member of the beaters closest to a side of the container; and

freezing the ingredients during the steps of mixing and rotating by adding a controlled amount of a coolant to the ingredient, wherein the coolant includes liquid nitrogen.

19. The method of claim 18 , wherein the container is rotated using a first motor and the beaters are turned using a second motor.

20. The method of claim 17 , wherein the viscosity is measured by monitoring load on a motor configured to rotate the container.

21. The method of claim 18 , further comprising measuring a temperature and controlling delivery of the coolant to the ingredients responsive to the measured temperature.

22. The method of claim 21 , wherein the measured temperature is a temperature of the ingredients.

23. The method of claim 21 , wherein the measured temperature is a temperature of a thermocouple.

24. The method of claim 21 , wherein the measured temperature is a measure of a metallic probe.

25. A system comprising:

a container configured to hold ingredients;

at least two interlocking beaters configured to mix the ingredients in the container and configured to be self clearing from each other and to clean a side surface of the container;

a liquid nitrogen dosing system configured to provide a controlled amount of cooling from a liquid nitrogen source to the ingredients;

a temperature sensor configured to measure the controlled amount of cooling; and

a controller configured to regulate the delivery of liquid nitrogen from the liquid nitrogen source in response to the measurement of the controlled amount of cooling.

26. The system of claim 25 , wherein the container is further configured to rotate.

27. The system of claim 25 , where one of the interlocking beaters is configured to be held stationary while an other of the interlocking beaters is rotated.

28. The system of claim 25 , wherein the interlocking beaters are configured to within ⅛ th inch of essentially all of a bottom of the container.

29. The system of claim 1 , further comprising a circuit configured to control delivery of the coolant to the ingredients responsive to a measured viscosity of the ingredients.