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US2026923A
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Method of operating retorts to produce coke, gas, and oil
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US1985304A
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Coking retort
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US1895284A
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Direct heated vertical retort
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US1581724A
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Method and apparatus for the extraction of coke from vertical retorts
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US1407996A
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Vertical retort for carbonizing coal
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US1251309A
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Baking-furnace.
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US1147790A
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Vertical retort for the production of gas by the carbonization of coal.
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US1065572A
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Apparatus for discharging substantially vertical retorts for the destructive distillation of coal.
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US906597A
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Vertical retort for the distillation of coal.
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US803154A
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Gas-condenser.
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US774911A
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Valve connection for gas-purifiers.
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US885308A
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Apparatus for the manufacture of gas.
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