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| All Patents in class 261/121.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 334,041 | Jan. 12, 1886 | L.H. Nash | Method of Operating Explosive Vapor Engines | |
 | 1,469,581 | Oct. 02, 1923 | B. Brazelle | Producing "Aquazone" quack medicine | |
| 1,877,296 | Sep. 13, 1932 | M.J. Goldberg | Cleaning and Silencing Means for Engine Exhausts | ||
| 2,074,597 | Mar. 23, 1937 | R.E. Stark | Aerating apparatus | ||
| 2,116,541 | May 10, 1938 | L. Roush, C. Riedel | Method for aerating liquids | ||