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Device for emitting vapors of active substance
| Details |
Inventors: Hennart, Claude; Dulat, Marcel; Blanc, Rene;
Assignee: Airwick Industries, Inc. (Carlstadt, NJ)
Primary Examiner: Mancene; Louis G.
Assistant Examiner: Leach; Daniel J.
Attorney, Agent or Firm: Jorda; Karl F.
A device destined for the emission of vapors of an active substance, in particular an insecticidal substance, is described which comprises, in a rigid assembly, A. a reservoir containing the active substance and having an evaporation surface for the emission of the active vapors, said reservoir comprising I. a system of two plates of a porous or fibrous material, one of the large faces of one of the plates facing one of the large faces of the other, and a frame for the plates which separates the space between the two plates from the exterior while leaving entirely or partially free at least one of the two large external faces of the two plates, which can thus serve as an evaporation surface, and Ii. an insecticidal organo-phosphorus substance having a vapor pressure, at 25.degree. C, of between 5 .times. 10.sup.-.sup.5 and 5 .times. 10.sup.-.sup.3 mbar, with or without addition of a pyrethrinoid insecticidal compound having a vapor pressure, at 25.degree. C, of between 1 .times. 10.sup.-.sup.6 and 2 .times. 10.sup.-.sup.4 mbar, B. an electrical resistance associated with the said reservoir in such a way as to heat at least the part of the said reservoir which comprises, or is close to, the said evaporation surface, said resistance being enclosed within the said system and being so constructed as to heat the large internal faces of the two plates to a temperature of up to 85.degree. C, and C. a system for connecting the resistance to a source of electric current. |
|
DETAILED DESCRIPTION We claim: 1.
A device destined for the emission of active vapours of an active substance, in particular an insecticidal substance, which comprises, in a rigid assembly, a.
a reservoir containing the active substance and having an evaporation surface for the emission of the active vapours, said reservoir comprising i.
a system of two plates of a porous or fibrous material, one of the large faces of one of the plates facing one of the large faces of the other, and a frame for the plates, which separates the space between the two plates from the exterior whilst leaving entirely or partially free at least one of the two large external faces of the two plates, which can thus serve as an evaporation surface, and ii.
an insecticidal organo-phosphorus substance having a vapour pressure, at 25.
degree.
C.
, of between 5 .
times.
10.
sup.
-.
sup.
5 and 5 .
times.
10.
sup.
-.
sup.
3 mbar, with or without addition of a pyrethrinoid insecticidal compound having a vapour pressure, at 25.
degree.
C.
, of between 1 .
times.
10.
sup.
-.
sup.
6 and 2 .
times.
10.
sup.
-.
sup.
4 mbar, said two plates being impregnated, with said substance or substances, the total evaporation surface of the two plates being at least 20 cm.
sup.
2, the amount of active substance in said reservoir being sufficient to give effective evaporation, at 85.
degree.
C.
for a period of at least 10 hours, and the thickness of the plates being sufficient to absorb the said amount of active substance, b.
an electrical resistance associated with the said reservoir in such a way as to heat at least the part of the said reservoir which comprises, or is close to, the said evaporation surface, said resistance being enclosed within the said system and being so constructed as to heat the large internal faces of the two plates to a temperature of up to 85.
degree.
C.
, and c.
a system for connecting the resistance to a source of electric current.
2.
A device as described in claim 1, wherein the two plates are placed in parallel, and flat, on either side of the electrical resistance
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