Junichi Ishiwatari
11Patents
6h-index
18Co-inventors
59Inventor score
Filing activity: Mar 17, 1992 → Feb 24, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5446725A | Method of changing over path switch in optical transmission device | Electricity | 59 | Expired |
| US6487686B1 | Error correction method and transmission apparatus | Electricity | 32 | Expired |
| US6201788A | Transmission device and system having the same | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5754545A | Add-drop multiplexer with enhancement of accessibility to signals in different hierarchical levels and flexibility in various services and circuit setting operations | Electricity | 14 | Expired |
| US6642845B2 | Signal transmitter and signal quality monitoring device | Electricity | 8 | Expired |
| US5574719A | Transmission system | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6728925B2 | Error correcting method and apparatus | Electricity | 6 | Expired |
| US5319488A | Terminal equipment and optical communication system using the same | Electricity | 6 | Expired |
| US5504761A | Apparatus for detecting error in a communications line | Electricity | 5 | Expired |
| US6252502A | Alarm detection apparatus | Electricity | 0 | Expired |
| US7020395B2 | Optical transmission apparatus monitoring optical performance | Electricity | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.