Koji Sumiya
41Patents
15h-index
49Co-inventors
81Inventor score
Filing activity: Nov 18, 1981 → Feb 21, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4992947A | Vehicular navigation apparatus with help function | Physics | 160 | Expired |
| US5121326A | Display system in navigation apparatus | Physics | 147 | Expired |
| US4954959A | Navigation system | Physics | 131 | Expired |
| US5231584A | Navigation apparatus with non-volatile memory for return to initial departure point | Physics | 124 | Expired |
| US5787383A | Vehicle navigation apparatus with route modification by setting detour point | Physics | 90 | Expired |
| US5115399A | Position input system for vehicular navigation apparatus | Physics | 81 | Expired |
| US5612881A | Map display system | Physics | 76 | Expired |
| US5103400A | Destination guidance method of vehicle navigating | Physics | 47 | Expired |
| US4943925A | Navigation apparatus based on present position calculating system | Physics | 34 | Expired |
| US4712635A | Control apparatus for four-wheel drive vehicle | Performing Operations; Transporting | 20 | Expired |
| US4616531A | Hydraulic and electronic control system for an automatic transmission | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US7044742B2 | Emergency reporting apparatus | Physics | 18 | Expired |
| US4727967A | Parking mechanism of a transmission | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4727773A | Hydraulic circuit for controlling automatic transmission | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4727774A | Cut-back pressure control device for multi-speed automatic transmission | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4748809A | Hydraulic servo mechanism of automatic transmission for vehicle | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4722250A | Accumulator back pressure control apparatus for automatic transmission | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US4722251A | Hydraulic circuit for controlling an automatic transmission | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US4727772A | Multistage automatic shift control apparatus | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5598910A | Clutch mechanism | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US4724745A | Hydraulic servo drum for friction clutch | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4839579A | Resistive steering sensor | Physics | 12 | Expired |
| US4854195A | Hydraulic control system for vehicular automatic transmission with two accumulator control values to vary back pressure to accumulator to follow the change in engine torque | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4697474A | Lock-up clutch control device for a multi-speed automatic transmission | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4618038A | Control apparatus of an automatic transmission with a lock-up clutch | Mechanical Engineering; Lighting; Heating | 10 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.