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| US5193984 | 10 okt 1991 | 16 mar 1993 | Deng-Huei Huang | Fan assembly |
| US5393197 | 9 nov 1993 | 28 feb 1995 | Lemont Aircraft Corporation | Propulsive thrust ring system |
| US5470202 | 8 nov 1993 | 28 nov 1995 | | Propulsive thrust ring system |
| US6582192 | 27 jul 2001 | 24 jun 2003 | | Omnidirectional electric fan |
| US7467931 | 3 feb 2006 | 23 dec 2008 | | Blower system for generating controlled columnar air flow |
