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| All Patents in class 159/4.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 981,188 | Jan. 10, 1911 | F.G. Hobart, W.W. Gore | Gas Cleaning Apparatus | gas cleaning apparatus | |
| 1,085,971 | Feb. 03, 1914 | W.H. Carrier | Method of humidifying air and controlling the humidity and temperature thereof | ||
| 1,172,429 | Feb. 22, 1916 | W.H. Carrier | Method for dehumidifying and cooling air | ||