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| All Patents in class 55/440 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 808,897 | Jan. 02, 1906 | W.H. Carrier | Apparatus for treating air | |
 | 854,270 | May 21, 1907 | W.H. Carrier | Method of heating and humidifying air | |
| 1,059,976 | Apr. 29, 1913 | W.H. Carrier | System for purifying, humidifying, and controlling the humidity of air | ||
| 1,402,147 | Jan. 03, 1922 | A.A. Day | Air washer and the like | ||