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| All Patents in class 210/258 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,518,835 | Aug. 15, 1950 | O.M. Summers | Filter system | coolant apparatus | |
| 3,840,120 | Oct. 08, 1974 | D.K. Greenberg | Apparatus for separating particles from liquid | ||
| 4,025,433 | May 24, 1977 | D.K. Greenberg | Magnetic separating apparatus | ||
| 4,950,392 | Aug. 21, 1990 | M.D. Tiegs, R.D. Liegel | Filtration tank for filtering waste water used in washing mechanical components | ||