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| All Patents in class 236/45 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,141,711 | Dec. 27, 1938 | B.M. Guthrie | Automatic Air Control Means | fans and blowers | |
| 2,218,930 | Oct. 22, 1940 | N. Cunningham | Automatic draft control | ||
| 2,351,878 | Jun. 20, 1944 | P.S. Russel | Controlling Means | flow controls | |
| 2,456,131 | Dec. 14, 1948 | W.S. Landon | Draft Control Means for Fuel Burners | flow controls | |