US4228124A
Expired / Lapsed
US
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Fumigating method and apparatus
Assignee: Earth Corp
•
Filing: 1979-05-25
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Granted: 1980-10-14
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Expires: 1999-05-25
Abstract
Abstract A mixture of an active ingredient such as insecticide, fungicide, repellent or the like and a blowing agent is heated with a hot air current produced by a suitable heat source and a fan to thermally decompose the blowing agent and cause the hot air current and the gas resulting from the thermal decomposition to vaporize and diffuse the active ingredient. The mixture is accommodated within a passage formed in a container and the passage is provided therein with a fan for forcing the hot air current therethrough. A fumigating method and an apparatus of this invention ensure very efficient, quick and uniform diffusion of the vapor of the active ingredients and are usable for controlling vermin and other purposes with high safety and great convenience.
Inventors
- 👤 Takanobu Kashihara
- 👤 Fukuyasu Okuda
- 👤 Masanaga Yamaguchi
- 👤 Akira Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:05
CPC Classifications
A; A01; A01M; A01M1/00; A01M1/20; A01M1/2022; A01M1/2061; A01M1/2077; A01M1/2072; A61; A61L; A61L9/00; A61L9/015; A61L9/02; A61L9/03; A01M2200/00; A01M2200/01; A01M2200/011; A01M2200/012
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
86 words
A fumigating method comprising heating a mixture of an active ingredient and a blowing agent with a hot air current to thermally decompose the blowing agent without entailing combustion and cause the hot air current and the gas resulting from the thermal decomposition to vaporize and diffuse the active ingredient, the blowing agent being decomposable at a temperature of about 70° C. to about 300° C. to mainly evolve nitrogen gas and contacting an object, material or an area to be treated with the so-generated fumigant.
Claim 2
Dependent Claim
86 words
A fumigating method comprising heating a mixture of an active ingredient and a blowing agent with a hot air current to thermally decompose the blowing agent without entailing combustion and cause the hot air current and the gas resulting from the thermal decomposition to vaporize and diffuse the active ingredient, the blowing agent being decomposable at a temperature of about 70° C. to about 300° C. to mainly evolve nitrogen gas and contacting an object, material or an area to be treated with the so-generated fumigant.
Claim 3
Dependent Claim
15 words
A fumigating method as defined in claim 1 wherein the active ingredient is an insecticide.
Claim 4
Dependent Claim
15 words
A fumigating method as defined in claim 1 wherein the active ingredient is a fungicide.
Claim 5
Dependent Claim
24 words
A fumigating method as defined in claim 1 wherein the hot air current has a temperature of about 70° C. to about 300° C.
Claim 6
Dependent Claim
17 words
A fumigating method as defined in claim 1 wherein the air current is produced by a fan.
Claim 7
Dependent Claim
20 words
A fumigating method as defined in claim 5 wherein the fan is driven at about 600 to about 12000 r.p.m.
Claim 8
Dependent Claim
40 words
A fumigating method as defined in claim 1 wherein the blowing agent is at least one species selected from the group consisting of azodicarbonamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide, p,p'-oxybis(benzenesulfonylhydrazide), dinitrosopentamethylenetetramine, N,N'-dinitroso-N,N'-dimethylterephthalamide, trihydrazinotriazine, azobisisobutyronitrile, 4,4'-azobiscyanovaleric acid, t-butylazoformamide, 2,4-bis-(azosulfonyl)toluene, 2,2'-azobisisobutyloamide, methyl-2,2'-azobisisobutyrate, 2-(carbamoylazo)isobutyronitrile and 1,1'-azobiscyclohexane-1-carbonitrile.
Claim 9
Dependent Claim
28 words
A fumigating method as defined in claim 7 wherein the blowing agent is at least one species selected from the group consisting of azodicarbonamide, p,p'-oxybis(benzenesulfonylhydrazide), azobisisobutyronitrile and 1,1'-azobiscyclohexane-1-carbonitrile.
Claim 10
Dependent Claim
14 words
A fumigating method as defined in claim 8 wherein the blowing agent is azodicarbonamide.
Claim 11
Dependent Claim
93 words
A fumigating apparatus comprising a container having a passage for forcing a hot air current therethrough, the passage being provided therein with a fan for forcing the hot air current and with a mixture of an active ingredient vaporizable and diffusable when heated with the hot air current and a blowing agent thermally decomposable when heated with the hot air current to promote the vaporization and diffusion of the active ingredient, said blowing agent being decomposable at a temperature of about 70° C. to about 300° C. to give off mainly nitrogen gas.
Claim 12
Dependent Claim
93 words
A fumigating apparatus comprising a container having a passage for forcing a hot air current therethrough, the passage being provided therein with a fan for forcing the hot air current and with a mixture of an active ingredient vaporizable and diffusable when heated with the hot air current and a blowing agent thermally decomposable when heated with the hot air current to promote the vaporization and diffusion of the active ingredient, said blowing agent being decomposable at a temperature of about 70° C. to about 300° C. to give off mainly nitrogen gas.
Claim 13
Dependent Claim
19 words
A fumigating apparatus as defined in claim 10 wherein the mixture is contained in a replaceable bag of netting.
Claim 14
Dependent Claim
20 words
A fumigating apparatus as defined in claim 10 wherein the mixture is contained in a replaceable case having air ports.
Claim 15
Dependent Claim
20 words
A fumigating apparatus as defined in claim 10 wherein the fan is driven at about 600 to about 12000 r.p.m.
Claim 16
Dependent Claim
15 words
A fumigating apparatus as defined in claim 10 wherein the active ingredient is an insecticide.
Claim 17
Dependent Claim
15 words
A fumigating apparatus as defined in claim 10 wherein the active ingredient is a fungicide.
Claim 18
Dependent Claim
21 words
A fumigating apparatus as defined in claim 10 wherein the passage has an open upper end sealed with a meltable film.
Claim 19
Dependent Claim
18 words
A fumigating apparatus as defined in claim 16 wherein the meltable film is reinforced with a reinforcing film.
Claim 20
Dependent Claim
40 words
A fumigating apparatus as defined in claim 10 wherein the blowing agent is at least one species selected from the group consisting of azodicarbonamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide, p,p'-oxybis(benzenesulfonylhydrazide), dinitrosopentamethylenetetramine, N,N'-dinitroso-N,N'-dimethylterephthalamide, trihydrazinotriazine, azobisisobutyronitrile, 4,4'-azobiscyanovaleric acid, t-butylazoformamide, 2,4bis-(azosulfonyl)toluene, 2,2'-azobisisobutyloamide, methyl-2,2'-azobisisobutyrate, 2-(carbamoylazo)isobutyronitrile and 1,1'-azobiscyclohexane-1-carbonitrile.
Claim 21
Dependent Claim
28 words
A fumigating apparatus as defined in claim 18 wherein the blowing agent is at least one species selected from the group consisting of azodicarbonamide, p,p'-oxybis(benzenesulfonylhydrazide), azobisisobutyronitrile and 1,1'-azobiscyclohexane-1-carbonitrile.
Claim 22
Dependent Claim
25 words
A fumigating apparatus as defined in claim 10 wherein means is provided for heating the air within the passage to produce the hot air current.
Claim 23
Dependent Claim
25 words
A fumigating apparatus as defined in claim 20 wherein the heating means is a means capable of evolving heat by application of an electric current.
Claim 24
Dependent Claim
24 words
A fumigating apparatus as defined in claim 20 wherein the heating means is an exothermic substance capable of evolving heat by contact with air.
Claim 25
Dependent Claim
24 words
A fumigating apparatus as defined in claim 20 wherein the heating means is an exothermic substance capable of evolving heat by contact with water.
Claim 26
Dependent Claim
28 words
A fumigating apparatus as defined in claim 23 wherein the substance is accommodated in a closed receptacle which is provided with means for supplying water to the substance.
Claim 27
Dependent Claim
34 words
A fumigating apparatus as defined in claim 24 wherein the closed receptacle is provided therein with a water-permeable layer through which the water from the water supplying means comes into contact with the substance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |