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| All Patents in class 210/223 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,720,974 | Oct. 18, 1955 | L.L. Fowler | Combined separator and filter | separators | |
| 3,456,797 | Jul. 22, 1969 | M. Roger | Apparatus and method for cleaning dirty liquid | ||
| 4,025,433 | May 24, 1977 | D.K. Greenberg | Magnetic separating apparatus | ||
| 4,110,218 | Aug. 29, 1978 | M. Roger, M.R. Estabrook | Liquid cleaning apparatus having cyclonic separators | separators | |
| 4,199,455 | Apr. 22, 1980 | M.R. Estabrook | Combined magnetic and cyclonic separating apparatus | ||