Shoji Yokoyama
68Patents
31h-index
86Co-inventors
91Inventor score
Filing activity: Dec 5, 1980 → Aug 30, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6278941A | Route guide system | Physics | 228 | Expired |
| US6166826A | Printing apparatus, printing method, and printing system | Physics | 182 | Expired |
| US4992947A | Vehicular navigation apparatus with help function | Physics | 160 | Expired |
| US5121326A | Display system in navigation apparatus | Physics | 147 | Expired |
| US4939662A | Navigation apparatus | Physics | 135 | Expired |
| US4954959A | Navigation system | Physics | 131 | Expired |
| US5654908A | Electronic diary with navigation destination output | Physics | 131 | Expired |
| US5231584A | Navigation apparatus with non-volatile memory for return to initial departure point | Physics | 124 | Expired |
| US5168452A | Route exploration method of navigation apparatus | Physics | 118 | Expired |
| US5559511A | Vehicle route guidance apparatus for re-searching for a new route when vehicle goes out of route | Physics | 96 | Expired |
| US5544061A | Navigation system with destination set by longitude and latitude coordinate points | Physics | 95 | Expired |
| US5043902A | Vehicular navigation apparatus | Physics | 95 | Expired |
| US5452212A | Navigation system for vehicle | Physics | 90 | Expired |
| US6263276A | Communicatory navigation system | Physics | 84 | Expired |
| US5115399A | Position input system for vehicular navigation apparatus | Physics | 81 | Expired |
| US4937751A | Navigation apparatus | Physics | 78 | Expired |
| US5410486A | Navigation system for guiding vehicle by voice | Physics | 78 | Expired |
| US5452217A | Navigation system for guiding vehicle orally | Physics | 69 | Expired |
| US6202024A | Communicatory navigation system | Physics | 69 | Expired |
| US5343399A | Vehicle navigation system | Physics | 65 | Expired |
| US5067082A | Navigation apparatus | Physics | 62 | Expired |
| US4882696A | Navigation apparatus | Physics | 49 | Expired |
| US5103400A | Destination guidance method of vehicle navigating | Physics | 47 | Expired |
| US5475599A | Vehicle navigation system | Physics | 46 | Expired |
| US5751228A | Guide system | Physics | 44 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.