Relatively Fixed Plural Elements Patents (Class 366/325.1)
- Blade detachably secured to hub (Class 366/330.2)
- Bowed or angled out of plane of rotation (Class 366/330.3)
- Outwardly increasing width (Class 366/330.4)
- Outwardly decreasing width (Class 366/330.5)
- Nonhorizontal, nonvertical axis of rotation (Class 366/330.6)
- Convex trailing edge in plane of rotation (Class 366/330.7)