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| All Patents in class 384/198 | |||||
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| Number | Date | Patentee | Title | Type | |
| 82,049 | Sep. 08, 1868 | D.M. Weston | Improved self-balancing centrifugal machine | centrifuges | |
| RE8,489 | Nov. 12, 1878 | D.M. Weston | Improvement in self-balancing centrifugal machines | centrifuges | |
| 603,395 | May 03, 1898 | M.F. Colby, S.A. Baker | Separating oil from metal cuttings | separators | |