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| All Patents in class 55/418 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,232,464 | Jul. 03, 1917 | C.R. Houghton | Dust-separator | dust collectors | |
| 1,762,385 | Jun. 10, 1930 | R.L. Clark, C.T. Craker | Combined separator and trap assembly | separators | |
| 1,866,196 | Jul. 05, 1932 | A.A. Criqui, R.T. Thornton | Gas purifier or scrubber | ||
| 2,384,414 | Sep. 04, 1945 | C.H. Antrim | Dust collector for grinding and other machines | ||
| 3,772,857 | Nov. 20, 1973 | G.H. Schultz, R.H. Jackson | Water Air Separator | separators | |