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| All Patents in class 55/473 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 294,248 | Feb. 26, 1884 | J.M. McIntyre | Method of and apparatus for separating dust from air | |
 | 2,103,893 | Dec. 28, 1937 | E.E. Buskirk | Portable air purifier unit | |
 | 2,390,101 | Dec. 04, 1945 | J.P. Jason | Suction cleaning apparatus | |
 | 2,524,347 | Oct. 03, 1950 | H.L. Gilmore | Filter unit | |