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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 |
| 4615934 | Warp knit weft insertion fabric and plastic sheet reinforced therewith A warp knit weft insertion fabric has a plurality of warp yarns and weft insertion yarns of a denier of at least about 1000, each of which yarns is separated from its neighbors by a plurality of yarns of a lower denier of about 220 to about 1800, the rati... | 10/07/1986 |
| 4508486 | Ventilation fan with noise-attenuating housing In a high-speed, high-volume ventilation fan, a noise-attenuating housing structure includes a perforated inner casing contained within a solid-walled outer casing. Filling the space between the inner and outer casings is a porous, sound-absorbing materia... | 04/02/1985 |
| 4421202 | Sound attenuator A sound attenuator comprising concentric inner and outer tubular members having sound absorbing material positioned therebetween. The inner tubular member comprises a lattice of reinforcing strand material coated with solidified resin wherein the strand m... | 12/20/1983 |
| 4358139 | Coupling for mine ventilation conduits A coupling for mine ventilation conduits comprising a first tubular conduit having a flared end portion for receiving an end portion of a second tubular conduit, at least one of the conduits having an elongate flexible strap attached thereto having a leng... | 11/09/1982 |
