Applicator device and system for packaging and applying a cosmetic product, and use of same

A system for packaging and applying a cosmetic product, comprising:

• a reservoir for containing a cosmetic product and having a neck defining a longitudinal axis;
• and
• an applicator device comprising:
• a body suitable for being held in the hand;
• an applicator head;
• a rod connecting the body and the applicator head;
• the applicator head comprising:
• a main body defining a longitudinal axis and comprising a storage portion adapted to be loaded with product and an application portion adapted to apply the product, passages being provided between the storage portion and the application portion, the storage portion comprising a groove having a main portion defining an axis of extension, the main body of the head having a certain length along the longitudinal axis and the main portion of the groove extending over a major portion of the length of the main body;
• a heating device adapted to heat the cosmetic product loaded on the applicator head, the heating device comprising a heating element lying within the groove;
• wherein the body is adapted to close the reservoir and the rod is adapted to penetrate the reservoir when said body closes the reservoir;
• wherein the heating element comprises a resistance wire having a main portion extending along the axis of extension of the main portion of the groove, over the entire length of the main portion of the groove;
• wherein the application portion comprises at least one row of teeth aligned in an alignment direction parallel to the longitudinal axis, the passages being formed by and/or opening into the spaces between the teeth;
• wherein the groove lies in a plane distanced from the longitudinal axis and parallel to the row of teeth of the application portion;
• and
• wherein the row of teeth has the general shape of a U centered on the longitudinal axis, the storage portion comprises two grooves that run one on each side of the row of teeth, and the heating device comprises two heating elements that lie within the grooves.