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Requirements for Unity of Application - Japan Patent Office

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[Example 69]<br />

[Title <strong>of</strong> the Invention]<br />

Hot metal desulfurization process and hot metal desulfurization agent<br />

[Claims]<br />

1. A process <strong>of</strong> hot metal desulfurization comprising calcium carbide powder in xx weight %<br />

<strong>of</strong> oil mixed in proportion <strong>of</strong> …kg/m 3 with a carrier gas and blown into the under side <strong>of</strong> the<br />

bath.<br />

2. A hot metal desulfurization agent comprising mixing <strong>of</strong> xx weight % <strong>of</strong> oil in calcium<br />

carbide powder.<br />

[Excerpt from Detail Description <strong>of</strong> the Invention]<br />

This invention concerns, in injection process desulfurization <strong>of</strong> hot metal, calcium<br />

carbide powder mixed with oil is used as desulfurization agent, thereby achieving efficiency in<br />

hot metal desulfurization process and desulfurization agent.<br />

Said oil can be gasoline, kerosene, vegetable oil, animal oil or waxes, and<br />

desulfurization agent, which includes one <strong>of</strong> the oils is blown into the <strong>for</strong>ge, the latter<br />

immediately turns into gas and destroys the particles <strong>of</strong> calcium carbide and disperses it,<br />

enlarging the area <strong>of</strong> contact with sulfur. Quick gassification, furthermore, improves the<br />

agitation in the bath, further improves desulfurization process. The oil also provides a better<br />

reducing environment in the bath, further improves efficiency <strong>of</strong> desulfurization.<br />

The proportion <strong>of</strong> calcium carbide powder to the oil is xx weight % <strong>for</strong> the reason <strong>of</strong>…<br />

In the said mixture, the calcium carbide powder digests the oil and manufactures<br />

calcium hydroxide on its surface, enhancing the motility <strong>of</strong> the powder, enabling a high<br />

proportion <strong>of</strong> calcium carbide to the carrier gas <strong>of</strong> …kg/m 3 to be carried by it, thereby reducing<br />

the amount <strong>of</strong> the carrier gas required in the process as well as a reduction in the amount <strong>of</strong><br />

calcium carbide powder, which also permits reduction in the temperature <strong>of</strong> the <strong>for</strong>ge.<br />

[Explanation]<br />

The related invention (Claim 2), hot metal desulfurization agent, is appropriate <strong>for</strong> the<br />

desulfurization. Even though it does not fall under the category <strong>of</strong> “equipment” being directly<br />

used in working the process <strong>of</strong> the specified invention (Claim 1), hot metal desulfurization<br />

process, it falls in the category <strong>of</strong> “other products” being directly used in working the process <strong>of</strong><br />

the specified invention.<br />

[Concerned Section]<br />

<strong>Patent</strong> Law Section 37(iv)<br />

116

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