US4163038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fumigating method and apparatus
Assignee: Earth Corp
•
Filing: 1978-03-02
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Granted: 1979-07-31
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Expires: 1998-03-02
Abstract
Abstract A mixture of an active ingredient and a blowing agent is heated indirectly with a heating element to thermally decompose the blowing agent and to volatilize the active ingredient. The mixture and the heating element are separated from each other by a partition which provides a heat transfer surface.
Inventors
- 👤 Akira Nishimura
- 👤 Takanobu Kashihara
- 👤 Fukuyasu Okuda
- 👤 Masanaga Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:42
CPC Classifications
A; A01; A01M; A01M1/00; A01M1/20; A01M1/2022; A01M1/2061; A01M1/2077; A61; A61L; A61L9/00; A61L9/015; A61L9/02; A61L9/03; A01M2200/00; A01M2200/01; A01M2200/011; A01M2200/012
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
94 words
A fumigating method comprising heating a mixture of an active ingredient and a blowing agent indirectly with a heating element capable of evolving heat by application of an electric current or a heating element capable of evolving heat by contact with air to thermally decompose the blowing agent without entailing combustion and to volatilize the active ingredient, said blowing agent being decomposable at a temperature of between about 70° C. and about 300° C. to give off mainly nitrogen gas and contacting an object, material or area to be treated with the so-generated fumigant.
Claim 2
Dependent Claim
94 words
A fumigating method comprising heating a mixture of an active ingredient and a blowing agent indirectly with a heating element capable of evolving heat by application of an electric current or a heating element capable of evolving heat by contact with air to thermally decompose the blowing agent without entailing combustion and to volatilize the active ingredient, said blowing agent being decomposable at a temperature of between about 70° C. and about 300° C. to give off mainly nitrogen gas and contacting an object, material or area to be treated with the so-generated fumigant.
Claim 3
Dependent Claim
14 words
A method as defined in claim 1 wherein the active ingredient is an insecticide.
Claim 4
Dependent Claim
14 words
A method as defined in claim 1 wherein the active ingredient is a fungicide.
Claim 5
Dependent Claim
27 words
A method as defined in claim 1 wherein the mixture is indirectly heated with a heating element capable of evolving heat by application of an electric current.
Claim 6
Dependent Claim
36 words
A method as defined in claim 4 wherein the heating element capable of evolving heat by application of an electric current is a heating wire, a heating carbon element or a thermistor of positive temperature coefficient.
Claim 7
Dependent Claim
25 words
A method as defined in claim 1 wherein the mixture is indirectly heated with a heating element capable of evolving heat by contact with air.
Claim 8
Dependent Claim
35 words
A method as defined in claim 6 wherein the heating element capable of evolving heat by contact with air is a mixture of sodium sulfide and at least one of iron carbide and carbon black.
Claim 9
Dependent Claim
41 words
A method as defined in claim 1 wherein said blowing agent is at least one species selected from the group consisting of azodicarbonamide, benzenesulfonylhydrazide, p-toluenesulfonylhydrazide, p,p'-oxybis(benzenesulfonylhydrazide), dinitrosopentamethylene tetramine, 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 10
Dependent Claim
28 words
A method as defined in claim 8 wherein the blowing agent is at least one species selected from the group consisting of azodicarbonamide, p,p'-oxybis(benzenesulfonylhydrazide), dinitrosopentamethylenetetramine, azobisisobutyronitrile and 1,1'-azobiscyclohexane-1-carbonitrile.
Claim 11
Dependent Claim
13 words
A method as defined in claim 9 wherein said blowing agent is azodicarbonamide.
Claim 12
Dependent Claim
84 words
A fumigating apparatus for practicing the method as defined in claim 1 comprising accommodated therein a mixture of an active ingredient and a blowing agent, and a heating element capable of evolving heat by application of an electric current, the mixture and the heating element being separated from each other by a partition interposed therebetween and providing a heat transfer surface, said blowing agent being decomposable at a temperature of between about 70° C. and about 300° C. to give off mainly nitrogen gas.
Claim 13
Dependent Claim
25 words
An apparatus as defined in claim 11 wherein the mixture and the heating element are separated from each other horizontally and vertically by the partition.
Claim 14
Dependent Claim
26 words
An apparatus as defined in claim 11 wherein a container containing the mixture is fitted in the upper portion of a container containing the heating element.
Claim 15
Dependent Claim
82 words
A fumigating apparatus for practicing the method as defined in claim 1 comprising accommodated therein a mixture of an active ingredient and a blowing agent, and a heating element capable of evolving heat by contact with air, the mixture and the heating element being separated from each other by a partition interposed therebetween and providing a heat transfer surface, said blowing agent being decomposable at a temperature of between about 70° C. and about 300° C. to give off mainly nitrogen gas.
Claim 16
Dependent Claim
25 words
An apparatus as defined in claim 14 wherein the mixture and the heating element are separated from each other horizontally and vertically by the partition.
Claim 17
Dependent Claim
37 words
An apparatus as defined in claim 14 wherein the heating element is contained in a container having an opening sealed with an openable film of air-impervious material, the heating element being held out of contact with air.
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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) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |