Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6108909 | Groove forming processes for shaft outer diameter | Frank Alton Gray, Mark Hazelton, Johannes van Witzenburg | 2000-08-29 |
| 5847479 | Self-pressure-balanced hydrodynamic bearing spindle motor | Jian Min Wang, Leoi Sun, Frank Alton Gray | 1998-12-08 |
| 5770906 | Compact electric motor construction employing fluid bearings | Mark Hazelton | 1998-06-23 |
| 5718516 | Spindle motors with hard coated hydrodynamic bearings | Frank Alton Gray | 1998-02-17 |
| 5689146 | Conical bearing system for spindle motors | — | 1997-11-18 |
| 5536088 | Fluid bearings for electronic spindle motors | Mark Hazelton, Frank Alton Gray | 1996-07-16 |
| 4694213 | Ferrofluid seal for a stationary shaft and a rotating hub | Hanumaiah L. Gowda, Frank Bloom | 1987-09-15 |