Hiroki Oka
58Patents
13h-index
63Co-inventors
87Inventor score
Filing activity: Jan 23, 1986 → Dec 27, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| USD533578S1 | Tripod | General | 48 | Expired |
| US4876527A | Vehicle speed detecting device | Performing Operations; Transporting | 43 | Expired |
| USD567798S1 | IC recorder | General | 22 | Expired |
| USD350753S | Digital audio disc player combined with a radio tuner and a tape recorder | General | 21 | Expired |
| USD542262S1 | IC recorder | General | 21 | Expired |
| USD581898S1 | Portable recorder | General | 21 | Expired |
| USD578994S1 | Portable recorder | General | 19 | Expired |
| USD527751S1 | Transfer-chamber | General | 18 | Expired |
| USD412515S | Video camera combined with video tape recorder | General | 17 | Expired |
| USD486845S1 | Video camera | General | 14 | Expired |
| USD623166S1 | Portable recorder | General | 14 | Expired |
| US6488262B1 | Gate valve for semiconductor processing system | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US6556240B2 | Video camera system having remote commander | Electricity | 13 | Expired |
| USD450741S | Video camera | General | 12 | Expired |
| USD461788S1 | Combined video printer and player/recorder | General | 11 | Expired |
| US7105847B2 | Semiconductor processing-purpose substrate detecting method and device, and substrate transfer system | Emerging Cross-Sectional Technologies | 9 | Expired |
| USD421032S | Stabilizer for a video camera | General | 7 | Expired |
| US4972095A | Binary digitizer circuit for voltages developed across induction coil | Physics | 7 | Expired |
| USD410431S | Battery charger | General | 7 | Expired |
| US9774273B2 | Electric device and method of controlling the same | Electricity | 6 | Active |
| USD556157S1 | Load-lock chamber | General | 6 | Expired |
| US4742988A | Electrical apparatus including solenoid device and energization control circuit therefor | Electricity | 6 | Expired |
| USD359044S | Combined tape player and radio | General | 5 | Expired |
| USD487095S1 | Disc cartridge | General | 5 | Expired |
| USD487446S1 | Disc player | General | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.