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| All Patents in class 210/512.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 453,105 | May 26, 1891 | E. Bretney | Water-purifier | |
| 3,489,286 | Jan. 13, 1970 | M.R. Estabrook | Hydrocyclone separator with particle trap | ||
| 3,494,474 | Feb. 10, 1970 | M.R. Estabrook | Hydrocyclone separator with vortex starter | ||
| 3,515,507 | Jun. 02, 1970 | M.R. Estabrook | Method and apparatus for decontaminating fluid with delayed filtering | ||
| 4,199,455 | Apr. 22, 1980 | M.R. Estabrook | Combined magnetic and cyclonic separating apparatus | ||