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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 3997438 | Process of treating gelatinous sludge agglomerations Gelatinous sludge agglomerations resulting from the clarification of raw water is separated from the raw water and is then treated with lime in an amount required to react with the gelatinous sludge and produce a filterable sludge in water. The filterable... | 12/14/1976 |
| 3975266 | Dewatering process A dewatering process for the separation and recovery of sludge from water reservoirs, such as, lakes, ponds, lagoons, rivers and the like is provided. The process includes the steps of dredging the reservoir, thickening the suspended matter in the water, ... | 08/17/1976 |
| 3969246 | Chromium removal and recovery process The present disclosure is directed to a process for removing and recovering chromium from waste water in the form of chromic acid and/or metallic chromate salts by the direct precipitation of chromium using barium carbonate in aqueous solutions acidified ... | 07/13/1976 |
| 3966601 | Effluent treatment A purification process for industrial effluent containing dissolved dithiocarbamate is described. Before discharging the effluent, it is mixed at pH 6 to 8 with a soluble heavy metal salt and heavy metal dithiocarbamate thereby precipitated and the precip... | 06/29/1976 |
| 3963471 | Apparatus and process for producing an organic product from sewage sludge A completely integrated and automated apparatus by which liquid sewage sludge from any sewage or waste treatment plant may be processed into a completely dry, pelletized and sterilized product of an organic nature containing nutrients valuable for the sup... | 06/15/1976 |
| 3933634 | Method of treatment of sludges with size-adjusted carbon A process for concentrating and separating solids from solid/liquid mixtures in the treatment of sewage sludge, which comprises incorporating into such sludge 2 to 10 % by weight of fine dust coal or lignite having such a size distribution that 30 to 50 %... | 01/20/1976 |
