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| Number | Title | Issue Date |
| 7584780 | Active heat sink structure with flow augmenting rings and method for removing heat An active heat sink is described for use in the transfer of heat from a heat generating device such as a semiconductor chip and the like with a heat sink having an embedded fan surrounded by a plurality of heat conducting flow augmenting rings separated by apertures... | 09/08/2009 |
| 5896917 | Active heat sink structure with flow augmenting rings and method for removing heat An active heat sink is described for use in the transfer of heat from a heat generating device such as a semiconductor chip and the like with a heat sink having an embedded fan surrounded by a plurality of heat conducting flow augmenting rings separated b... | 04/27/1999 |
| 5393197 | Propulsive thrust ring system Improvements to a propulsion thrust apparatus are described wherein a propeller is surrounded by a ring cage structure with which propeller tip vortices are converted to useful mass flow with a plurality of rings whose spacing from each other and the prop... | 02/28/1995 |
