Nobuo Akahira
69Patents
21h-index
32Co-inventors
88Inventor score
Filing activity: Nov 18, 1976 → Feb 27, 2006
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6456584B1 | Optical information recording medium comprising a first layer having a phase that is reversibly changeable and a second information layer having a phase that is reversibly changeable | Physics | 99 | Expired |
| US5097464A | Optical recording medium and optical recording/reproducing apparatus | Physics | 91 | Expired |
| US5568461A | Optical information recording and reproducing apparatus | Physics | 71 | Expired |
| US5764619A | Optical recording medium having two separate recording layers | Physics | 70 | Expired |
| US5109373A | Optical information recording method | Physics | 69 | Expired |
| US5216657A | Method and apparatus for timing variable optical information recording | Physics | 52 | Expired |
| US5745475A | Optical information recording medium | Physics | 51 | Expired |
| US5150351A | Optical information recording apparatus for recording an input signal having variable width pulse duration and pulse spacing periods | Physics | 43 | Expired |
| US5412626A | Method of recording optical information with selective correction in pulse waveform and a recording system therefor | Physics | 39 | Expired |
| US5635267A | Optical information recording medium of phase change type having variably grooved tracks depending on their radial locations | Emerging Cross-Sectional Technologies | 38 | Expired |
| US5811217A | Optical information recording medium and optical information recording/reproducing method | Emerging Cross-Sectional Technologies | 35 | Expired |
| US5493561A | Optical information recording medium and information recording and reproducing method thereof | Physics | 34 | Expired |
| US5545454A | Optical information recording medium and method of designing its structure | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5898394A | Code conversion method and apparatus, code recording medium, code recording apparatus and code reproducing apparatus | Electricity | 27 | Expired |
| US4278734A | Optical information recording material and method of recording and reproducing information using same material | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5305297A | Method for determining optimum irradiation conditions in optical data recording | Physics | 26 | Expired |
| US5249175A | Optical information recording medium and information recording and reproducing method therefor | Physics | 25 | Expired |
| US5154957A | Optical information recording medium | Emerging Cross-Sectional Technologies | 25 | Expired |
| US6031814A | Optical disk with stop-pulse generating means in a guide groove | Physics | 25 | Expired |
| US6487151B1 | Optical information recording and reproducing system with overwrite capability and recording medium for use therewith | Physics | 25 | Expired |
| US5272667A | Optical information recording apparatus for recording optical information in a phase change type optical recording medium and method therefor | Physics | 23 | Expired |
| US5289453A | Optical information recording method | Physics | 21 | Expired |
| US5348783A | Optical information recording medium | Emerging Cross-Sectional Technologies | 21 | Expired |
| US5424106A | Optical information recording medium and method of designing its structure | Emerging Cross-Sectional Technologies | 20 | Expired |
| US5410534A | Optical information recording medium | Physics | 20 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.