Hirofumi Nagano
32Patents
10h-index
25Co-inventors
75Inventor score
Filing activity: Jul 21, 1994 → Jul 1, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5570339A | Optical disc and a recording and/or reproducing apparatus having copy-protection function | Physics | 98 | Expired |
| US5696757A | Optical disc, device for checking optical disc and device for recording information on optical disc | Physics | 89 | Expired |
| US5572507A | Optical disc, device for checking optical disc, and device for recording information on optical disc | Physics | 83 | Expired |
| US6930977B1 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 43 | Expired |
| US6122245A | Optical recording medium and reproducing apparatus for optical recording medium | Physics | 27 | Expired |
| US6380566B1 | Semiconductor device having FET structure with high breakdown voltage | Electricity | 19 | Expired |
| US7072285B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 18 | Expired |
| US5841861A | Optical recording medium and reproducing apparatus for optical recording medium | Physics | 17 | Expired |
| US7406026B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 11 | Active |
| US6563193B1 | Semiconductor device | Electricity | 11 | Expired |
| US7457228B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 9 | Active |
| US7672216B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 8 | Active |
| US8304827B2 | Semiconductor device having on a substrate a diode formed by making use of a DMOS structure | Electricity | 7 | Active |
| US6188653A | Optical storage medium and apparatus and method of reproducing data therefrom using different laser power | Physics | 6 | Expired |
| US7664007B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 4 | Active |
| US7911931B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 4 | Active |
| US7656784B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US6708878B2 | Service providing method | Physics | 2 | Expired |
| US7656785B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US8223621B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US7656783B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US7406025B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US7889631B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US8139470B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
| US8335150B2 | Optical information recording medium, and substrate and manufacturing method for the optical information recording medium | Physics | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.