Sumio Ashida
31Patents
7h-index
31Co-inventors
69Inventor score
Filing activity: Feb 6, 1987 → Sep 20, 2010
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6554972B1 | Information recording medium and its manufacturing method | Emerging Cross-Sectional Technologies | 52 | Expired |
| US7214416B2 | Phase-change optical recording medium | Emerging Cross-Sectional Technologies | 32 | Expired |
| US6296915A | Optical recording medium | Emerging Cross-Sectional Technologies | 15 | Expired |
| US7883930B2 | Phase change memory including a plurality of electrically conductive bodies, and manufacturing method thereof | Emerging Cross-Sectional Technologies | 15 | Active |
| US5175714A | Method of magneto-optically recording/erasing information and magneto-optical information storage medium including recording and bias layers satisfying certain conditions | Physics | 13 | Expired |
| US7245576B2 | Optical recording medium and optical recording-reproducing method | Physics | 11 | Expired |
| US8169879B2 | Optical recording system to record information with light | Physics | 8 | Active |
| US6805935B2 | Optical recording medium | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4839861A | Information recording medium rewritable by utilizing two metastable phases of a recording layer and method using the same | Physics | 7 | Expired |
| US6240060A | Phase change optical recording medium | Physics | 6 | Expired |
| US5105400A | Method of magneto-optically recording and erasing information onto a magneto-optical information storage medium | Physics | 5 | Expired |
| US7455951B2 | Information recording medium and its manufacturing method | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5412627A | A magneto-optical recording system including a recording medium having a reversal preventive layer for preventing a magnetization reversal of a bias layer which is magnetostatically coupled to a recording layer | Physics | 4 | Expired |
| US6944116B2 | Optical information recording medium | Physics | 4 | Expired |
| US6842419B2 | Optical information recording medium and optical disk drive | Physics | 3 | Expired |
| US7357969B2 | Phase-change optical recording medium | Emerging Cross-Sectional Technologies | 3 | Expired |
| US7335459B2 | Phase-change optical recording medium | Physics | 3 | Expired |
| US7542404B2 | Optical recording media | Physics | 3 | Active |
| US7477586B2 | Optical disk apparatus for distinguishing recording media including single-layer and double-layer H-L media and L-H medium | Physics | 2 | Active |
| US7858166B2 | Phase change recording medium | Emerging Cross-Sectional Technologies | 2 | Active |
| US7510990B2 | Sputtering target, optical thin film and manufacturing method thereof using the sputtering target, and optical recording medium | Physics | 2 | Active |
| US7767285B2 | Phase-change optical recording medium | Emerging Cross-Sectional Technologies | 1 | Active |
| US7510753B2 | Phase-change optical recording media | Physics | 1 | Active |
| US8487345B2 | Information recording and reproducing device | Physics | 1 | Active |
| US7294382B2 | Phase-change optical recording medium | Emerging Cross-Sectional Technologies | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.