Hirohiko Sagawa
15Patents
12h-index
31Co-inventors
78Inventor score
Filing activity: Mar 9, 1993 → Jun 11, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6477239B1 | Sign language telephone device | Electricity | 168 | Expired |
| US5699441A | Continuous sign-language recognition apparatus and input apparatus | Physics | 130 | Expired |
| US5544050A | Sign language learning system and method | Physics | 123 | Expired |
| US6181778A | Chronological telephone system | Electricity | 104 | Expired |
| US5734923A | Apparatus for interactively editing and outputting sign language information using graphical user interface | Physics | 104 | Expired |
| US5887069A | Sign recognition apparatus and method and sign translation system using same | Physics | 100 | Expired |
| US5659764A | Sign language generation apparatus and sign language translation apparatus | Physics | 95 | Expired |
| US5953693A | Sign language generation apparatus and sign language translation apparatus | Physics | 86 | Expired |
| US5990878A | Sign language editing apparatus | Physics | 74 | Expired |
| US5481454A | Sign language/word translation system | Physics | 39 | Expired |
| US5473705A | Sign language translation system and method that includes analysis of dependence relationships between successive words | Physics | 34 | Expired |
| US6549887B1 | Apparatus capable of processing sign language information | Physics | 17 | Expired |
| US8150678B2 | Spoken document retrieval system | Physics | 6 | Active |
| US8694323B2 | In-vehicle apparatus | Physics | 4 | Active |
| US11835412B2 | Delicate work tool digitalization system | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.