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US 4,228,124 AGranted
Fumigating method and apparatus
AssigneeEarth Chemical Co., Ltd.
InventorsTakanobu Kashihara, Fukuyasu Okuda, Masanaga Yamaguchi, Akira Nishimura
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AssigneeEarth Chemical Co., Ltd.
InventorsTakanobu Kashihara, Fukuyasu Okuda, Masanaga Yamaguchi, Akira Nishimura
Estimating the term…
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.
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.degree. C. to about 300.degree. C. to mainly evolve nitrogen gas and contacting an object, material or an area to be treated with the so-generated fumigant.
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.degree. C. to about 300.degree. C. to give off mainly nitrogen gas.
Dependencies are inferred from the claim text.