|
| US4441857 | 25 sept. 1981 | 10 avr. 1984 | Union Carbide Corporation | Wear resistant fan blade for centrifugal fan |
| US4872484 | 12 déc. 1988 | 10 oct. 1989 | | System for controlling the flow of a fluid medium relative to an object |
| US4974633 | 19 déc. 1989 | 4 déc. 1990 | | System for controlling the flow of a fluid medium relative to an object |
| US5075564 | 23 févr. 1990 | 24 déc. 1991 | | Combined solar and wind powered generator with spiral surface pattern |
| US5254876 | 28 mai 1992 | 19 oct. 1993 | | Combined solar and wind powered generator with spiral blades |
| US7866952 | 22 mars 2008 | 11 janv. 2011 | International Business Machines Corporation | Fan with improved heat dissipation |