Umemura; Naomitsu
Patent Applications and Registrations
Patent applications and USPTO patent grants for Umemura; Naomitsu.The latest application filed is for "diffraction element and optical head device".
- Umemura; Naomitsu - Tokyo JP
| Patent | Date |
|---|---|
| Diffraction element and optical head device App 20060193235 - Murata; Koichi ; et al. | 2006-08-31 |
| Retarder and optical head device installing the same Grant 6,917,576 - Nishiyama , et al. July 12, 2 | 2005-07-12 |
| Retarder and optical head device installing the same App 20030174631 - Nishiyama, Takehiko ; et al. | 2003-09-18 |
| Retarder and optical head device installing the same App 20030123371 - Nishiyama, Takehiko ; et al. | 2003-07-03 |
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