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| Patents for Derrel N. Stewart | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,231,022 | Jan. 25, 1966 | J.W. Schroeter, D.N. Stewart | Axial fan construction | ||
| 3,294,315 | Dec. 27, 1966 | D.N. Stewart, R. Olson | Fan construction | ||
| CA-779,131 | Feb. 27, 1968 | J.W. Schroeter, D.N. Stewart | Axial fan construction | ||
| CA-795,649 | Oct. 01, 1968 | O. Russell, D.N. Stewart | Fan construction | ||
| 3,545,884 | Dec. 08, 1970 | J.W. Schroeter, D.N. Stewart | Adjustable fan construction | ||
| CA-917,119 | Dec. 19, 1972 | D.N. Stewart, J.W. Schroeter | Adjustable fan construction | ||