Air freshener device using external capillaries

• US 4,913,350 A
• Filed: 03/18/1988
• Issued: 04/03/1990
• Est. Priority Date: 03/18/1988
• Status: Expired due to Term

• Current Assignee: Givaudan Corp. (Givaudan SA)
• Original Assignee: Givaudan Corp. (Givaudan SA)
• Inventors: Purzycki, Kenneth L.
• Primary Examiner(s): Kashnikow, Andres
• Assistant Examiner(s): Forman, Michael J.
• Application Number:
  US07/169,664
• Time in Patent Office: 746 Days
• Field of Search: 239/6, 239/34, 239/44, 239/51.5, 261/99, 261/110
• US Class Current: 239/44
• CPC Class Codes: A61L 9/127 comprising a wick

Abstract

An air freshening device which allows a liquid fragrance material to be dispensed into the ambient air of a room or other designated area in a linear fashion, i.e., without distortion of the odor character and without a change in the rate of delivery. More particularly, the device comprices a reservoir, a fragrance material, and an external capillary member, wherein said external capillary member has one or more external capillary cavities, the lower portion of said capillary being in contact with the liquid fragrance material to be dispensed, and the upper portion of said capillary being exposed to the air in the room or area into which it is desired to dispense the fragrance.

Claims

1. A device for the evaporation of a multi-component liquid into the ambient air which comprises

(a) a container which maintains a supply of said multi-component liquid in isolation from said ambient air,

(b) said liquid to be evaporated,

(c) a non-porous, non-absorbing external capillary member extending from the interior of said container, through the container wall, to the outside of said container and having at least one external capillary cavity, said external capillary cavity having

(i) a portion in contact with said multi-component liquid in the container, and

(ii) a portion in contact with said ambient air such that the portion in contact with said liquid in the container and the portion in contact with said ambient air are connected to one another by the same external capillary cavity and,

wherein the length of the portion of said external capillary that is in between the portion that is in contact with the said liquid in the container and the portion that is in contact with said ambient air into which said liquid is to be dispensed is less than the height that said liquid will rise in said capillary cavity such that the ability to evaporate the multi-component liquid in a linear fashion is maintained throughout the evaporation of the liquid.

2. The liquid evaporating device of claim 1 wherein said liquid to be evaporated is a multi-component fragrance material and said liquid evaporation device is used as an air freshner.

3. The liquid evaporating device of claim 2, wherein said external capillary cavity has:

(a) a length h_t -h_b, wherein h_t represents the top of the capillary cavity and is exposed to the ambient air, and h_b represents the base of the capillary cavity and is exposed to the liquid in the container;

(b) a portion h_o -h_b which is exposed to the liquid in the container, wherein h_o represents the top point of the capillary cavity that is exposed to the liquid in the container;

(c) a portion h_t -h_a which is exposed to the ambient air, wherein h_a is the bottom point of the capillary cavity that is exposed to the ambient air,

(d) a portion h_a -h_o which represents any portion of the capillary cavity which is not exposed to the ambient air or to the liquid;

(e) a uniform cross-sectional area equal to b; and

(f) a contact length between the upper surface of the liquid and the wall of the capillary cavity equal to p;

wherein h_a -h_o is less than 0.036 (p/b) cm.

4. The liquid evaporating device of claim 3 wherein said external capillary cavity has essentially 3 sides, one of which is partially open to the ambient air.

5. The liquid evaporating device of claim 4 wherein said external capillary cavity has greater than 50% of the third side open to the ambient air.

6. The liquid evaporating device of claim 5 wherein said external capillary cavity is essentially an isosceles triangle with the side opposite to the apex angle open to the ambient air.

7. The liquid evaporating device of claim 6 wherein the angle between the two unopened sides is less than 30 degrees.

8. The liquid evaporating device of claim 7 wherein said angle between the two unopened sides is less than 15 degrees.

9. The liquid evaporating device of claims 7 or 8, wherein h_a -h_b is less than 0.036 (p/b) cm.

10. The liquid evaporating device of claims 7 or 8, wherein h_t -h_b is less than 0.036 (p/b) cm.

11. The liquid evaporating device of claim 10, wherein p/b exceeds 200 cm^-1.

12. The liquid evaporating device of claim 10, wherein p/b is between 250 and 550 cm^-1.