Takao Koyama
29Patents
11h-index
38Co-inventors
75Inventor score
Filing activity: Jan 29, 1988 → Apr 4, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6706030B1 | Absorbent article | Human Necessities | 61 | Expired |
| US6514382B1 | Process for producing bulky paper | Textiles; Paper | 58 | Expired |
| US5943374A | Out-of-synchronization recovery method and apparatus of data transmission system | Electricity | 43 | Expired |
| US7094227B2 | Disposable diaper having leg flap absorbent articles | Human Necessities | 23 | Expired |
| US5977211A | Ball point pen filled with erasable ink | Chemistry; Metallurgy | 18 | Expired |
| US6401899B1 | Parking lock device and method for automatic transmission | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US7405865B2 | Liquid for electrophoretic display, display medium and display device using the same | Physics | 16 | Expired |
| US6409408B1 | Writing instrument | Chemistry; Metallurgy | 13 | Expired |
| US7938814B2 | Disposable diaper | Human Necessities | 12 | Active |
| US4974715A | Oil passages of torque converter | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US4949821A | Automatic transmission | Mechanical Engineering; Lighting; Heating | 11 | Expired |
| US7520874B2 | Disposable diaper with improved leak prevention properties | Human Necessities | 10 | Active |
| US5716434A | Non-erasable pencil lead | Chemistry; Metallurgy | 8 | Expired |
| US7600938B2 | Refill for correction pen and refill unit | Chemistry; Metallurgy | 7 | Expired |
| US6517273B2 | Free-ink type writing instrument | Performing Operations; Transporting | 7 | Expired |
| US5487627A | Counter sink drill | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4863649A | Process for producing carbon heat generator | Chemistry; Metallurgy | 5 | Expired |
| US7156830B2 | Disposable diaper including lateral side cores | Human Necessities | 4 | Expired |
| US8684617B2 | Writing instrument | Performing Operations; Transporting | 4 | Active |
| US5944438A | Writing instrument | Performing Operations; Transporting | 4 | Expired |
| US5178908A | Process for coating carbonized material with metal | Chemistry; Metallurgy | 3 | Expired |
| US7811187B2 | Continuously variable transmission | Mechanical Engineering; Lighting; Heating | 3 | Active |
| US6623393B2 | Drive belt for continuously variable transmission | Mechanical Engineering; Lighting; Heating | 2 | Expired |
| US6878139B2 | Disposable diaper including lateral side cores | Human Necessities | 2 | Expired |
| US4916899A | Stator shaft connection through oil pump of automatic transmission | Mechanical Engineering; Lighting; Heating | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.