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| All Patents in class 261/90 | |||||
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| Number | Date | Patentee | Title | Type | |
| 138,409 | Apr. 29, 1873 | T. Judd, E. Doty | Improvement in apparatus for carbureting air | ||
| 845,460 | Feb. 26, 1907 | W.W. Gore | Centrifugal Tar Extractor | gas cleaning apparatus | |
| 1,866,196 | Jul. 05, 1932 | A.A. Criqui, R.T. Thornton | Gas purifier or scrubber | ||