Hiroshi Oka
26Patents
12h-index
55Co-inventors
84Inventor score
Filing activity: Sep 6, 1979 → Aug 20, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5128574A | Brushless motor | Electricity | 57 | Expired |
| US5036370A | Thin film semiconductor array device | Electricity | 55 | Expired |
| US5019479A | Positive type radiation-sensitive resin composition comprising a photosensitizer and a novolak resin | Physics | 33 | Expired |
| US5202388A | Process for producing hydrogenation product of ring-opening polymer | Chemistry; Metallurgy | 33 | Expired |
| USD689865S1 | Scanner | General | 23 | Active |
| US5128818A | Stable disc unit having reduced thickness | Electricity | 21 | Expired |
| US6441495B1 | Semiconductor device of stacked chips | Electricity | 19 | Expired |
| US4454310A | Polyamide acid, process for producing same and polyimide obtained therefrom | Chemistry; Metallurgy | 18 | Expired |
| US6413797B2 | Semiconductor device and method for making the same | Electricity | 18 | Expired |
| US5164469A | Transparent resin material | Chemistry; Metallurgy | 15 | Expired |
| US6861760B2 | Semiconductor device with stacked-semiconductor chips and support plate | Electricity | 14 | Expired |
| US5011960A | Wiring pattern detection method and apparatus | Physics | 12 | Expired |
| US6460858B1 | Mechanical seal | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US5689388A | Reduced-height magnetic disk drive unit, and disk mounting device for the unit | Physics | 9 | Expired |
| US7392706B2 | Pressure sensor device | Physics | 8 | Expired |
| US4886840A | Diluent for UV and EB curable resins | Physics | 7 | Expired |
| US5294492A | Acicular magnetic iron oxide particles | Emerging Cross-Sectional Technologies | 6 | Expired |
| US7242100B2 | Method for manufacturing semiconductor device with plural semiconductor chips | Electricity | 6 | Expired |
| US4544391A | Method for separation of solid mixtures by simultaneous multi-stage recrystallization | Performing Operations; Transporting | 4 | Expired |
| US5886161A | Process for producing an alkylglycoside | Chemistry; Metallurgy | 3 | Expired |
| US4283579A | Process for producing diol | Chemistry; Metallurgy | 1 | Expired |
| US4268447A | Process for producing tetrahydrofuran and 1,4-butanediol | Chemistry; Metallurgy | 1 | Expired |
| US5292950A | N,N-dialkylaminoalkyl (meth) acrylamide composition with improved storageability | Performing Operations; Transporting | 1 | Expired |
| US7879877B2 | Carbostyril derivatives for accelerating salivation | Human Necessities | 1 | Expired |
| US5525692A | Dewatering agent for sludge | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.