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| All Patents in class 55/439 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,368,343 | Jan. 30, 1945 | E.E. Buskirk | Air purifier | dust collectors | |
| 2,381,914 | Aug. 14, 1945 | J. Leflar, V.L. Darnell | Motor housing | motor housings | |
| 2,732,032 | Jan. 24, 1956 | A.G. Sandison | Dust collector | waste collection mechanisms | |