Kouichi Hirayama
2Patents
1h-index
3Co-inventors
30Inventor score
Filing activity: Sep 8, 1998 → Aug 23, 2002
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6490683B1 | Optical disk having electronic watermark, reproducing apparatus thereof and copy protecting method using the same | Physics | 136 | Expired |
| US6873999B2 | Maintenance information management server maintenance information management system using the same, as well as method of managing maintenance information | Emerging Cross-Sectional Technologies | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.