Jun-ichi Umeda
12Patents
10h-index
17Co-inventors
65Inventor score
Filing activity: Apr 12, 1977 → Dec 28, 1988
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4503540A | Phase-locked semiconductor laser device | Electricity | 40 | Expired |
| US4337443A | Semiconductor laser device with facet passivation film | Electricity | 35 | Expired |
| US4176325A | Semiconductor laser device | Electricity | 32 | Expired |
| US4369513A | Semiconductor laser device | Electricity | 30 | Expired |
| US4326176A | Semiconductor laser device | Electricity | 24 | Expired |
| US5031172A | Unit and disc having a relatively rough surface and method of producing | Physics | 21 | Expired |
| US4257011A | Semiconductor laser device | Electricity | 20 | Expired |
| US4432091A | Semiconductor laser device | Electricity | 15 | Expired |
| US4288757A | Semiconductor laser device | Electricity | 13 | Expired |
| US4509173A | Phase-locked semiconductor laser device | Electricity | 10 | Expired |
| US4404678A | Semiconductor laser device | Electricity | 9 | Expired |
| US4426703A | Semiconductor laser device | Electricity | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.