# US 8,465,784 B2 · Method for the microwave thawing of food products

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- Number: US 8,465,784 B2
- Document ID: US8465784B2
- Status: Granted
- Kind: B2
- Application number: 12/921,900
- Filed: 2009-03-03
- Published: 2011-01-20
- Granted: 2013-06-18
- Earliest claimed: 2008-03-10
- Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
- Applicants: Moez Tammar; Pierre Kowalewski
- Inventors: Moez Tammar; Pierre Kowalewski
- Web page: https://patentgrep.com/patent/US8465784B2

## CPC

- A23B 2/82: Thawing subsequent to freezing
- A23B 4/07: Thawing subsequent to freezing
- H05B 6/688: {for thawing}
- H05B 6/782: {wherein the material moved is food}
- A23B: PRESERVATION OF FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES; CHEMICAL RIPENING OF FRUIT OR VEGETABLES
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

The invention related to a method and a device for thawing food products that comprises using at least one microwave radiation applicator in a chamber through which said products are passing, characterized in that before the insertion into the chamber or a first inlet area of the chamber, all the surfaces of the product are covered with a homogenous film of carbon dioxide snow in the form of electrostatically charged microparticles.

## Claims

### Claim 1

A method for thawing food products employing the action, in a chamber through which the products pass, of at least one applicator of microwave radiation, wherein before the product enters the chamber or a first entrance zone of the chamber, all surfaces of the product are covered with an even film of carbon dioxide snow in the form of electrostatically charged microparticles.

### Claim 2 (depends on 1)

The thawing method of claim 1, wherein, in order to cover the surfaces of the product with an even film of carbon dioxide snow, use is made of one or more cyclone-type devices for producing carbon dioxide snow and applying it to the product, the one or more devices being equipped with a convergent cone made of polymer.

### Claim 3 (depends on 1)

The thawing method of claim 1, wherein, in order to cover the surfaces of the product with an even film of carbon dioxide snow, use is made of first and second cyclone-type devices, the first cyclone-type device being positioned upstream of the entrance to the chamber and of the product loading zone, the second cyclone-type device being positioned inside the entrance zone of the chamber, wherein the products move continuously forward through the system.

### Claim 4

A method for thawing food products employing the action, in a chamber through which the products pass, of at least one applicator of microwave radiation, wherein before the product enters the chamber or a first entrance zone of the chamber, all surfaces of the product are covered with an even film of carbon dioxide snow in the form of electrostatically charged microparticles, wherein:
in order to cover the surfaces of the product with an even film of carbon dioxide snow, use is made of a single cyclone-type device positioned upstream of an opening of the chamber or positioned upstream of the chamber in the entrance zone thereof above a conveyor; and
said method follows a sequence comprises the steps of:
depositing a film of snow (i+1) on the conveyor;
bringing the conveyor one step backward in order to bring the desposited film (i+1) to face a product depositing system and depositing a product (i+1) on the film of snow (i+1) previously deposited;
bringing the conveyor two steps forward and depositing a new film of snow (i) on the conveyor upstream of the previous product (i+1);
bringing the conveyor one step backward in order to place the product (i+1) opposite the cyclone-type device and deposit snow on the product (i+1) followed by depositing a product (i) on the film (i);
bringing the conveyor two steps forward and depositing a film of snow (i−1) on the conveyor upstream of the film (i); and
bringing the conveyor one step backward in order to deposit a product (i−1) on the film (i−1) followed by depositing snow on the product (i).

### Claim 5 (depends on 4)

The thawing method of claim 4, wherein performance of said sequence makes it possible to obtain a product residence time of 10 to 15 minutes inside the chamber.