Kiyofumi Nagai
82Patents
24h-index
68Co-inventors
91Inventor score
Filing activity: Feb 24, 1986 → Jul 5, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5431720A | Aqueous ink composition and ink-jet printing method using the same | Chemistry; Metallurgy | 181 | Expired |
| US4711668A | Aqueous ink composition | Chemistry; Metallurgy | 83 | Expired |
| US5879439A | Recording ink composition and recording method using the same | Chemistry; Metallurgy | 80 | Expired |
| US4647310A | Aqueous ink composition for ink jet-recording | Chemistry; Metallurgy | 80 | Expired |
| US5993524A | Image recording method, image recording apparatus and image recording acceleration liquid | Performing Operations; Transporting | 71 | Expired |
| US5882390A | Recording ink composition and recording method using the same | Chemistry; Metallurgy | 67 | Expired |
| US5972082A | Aqueous ink composition and ink-jet printing method using the same | Chemistry; Metallurgy | 61 | Expired |
| US6231652A | Aqueous ink compositions and ink-jet printing method using the same | Chemistry; Metallurgy | 58 | Expired |
| US5622550A | Yellow ink composition for ink-jet printing and image recording method using the same | Performing Operations; Transporting | 54 | Expired |
| US6120589A | Set of color ink compositions for ink-jet printing and method of forming color images using the color ink set | Chemistry; Metallurgy | 53 | Expired |
| US5514208A | Aqueous ink and method for recording image with the aqueous ink | Chemistry; Metallurgy | 52 | Expired |
| US5810915A | Aqueous ink composition and image formation method using the same | Performing Operations; Transporting | 49 | Expired |
| US4793860A | Aqueous ink composition | Chemistry; Metallurgy | 49 | Expired |
| US6261349A | Image recording method image recording apparatus and image recording acceleration liquid | Chemistry; Metallurgy | 47 | Expired |
| US8242201B2 | Pigment dispersion, recording ink, ink cartridge, ink-jet recording method and ink-jet recording apparatus | Emerging Cross-Sectional Technologies | 45 | Active |
| US8304043B2 | Inkjet recording ink and recording media set, inkjet recording method, recorded matter and recording apparatus | Emerging Cross-Sectional Technologies | 44 | Active |
| US6613136B1 | Recording ink composition and ink-jet printing method using the same | Chemistry; Metallurgy | 44 | Expired |
| US5462592A | Aqueous ink composition | Chemistry; Metallurgy | 39 | Expired |
| US6695443B2 | Ink for ink jet recording, ink set for ink jet recording, method for ink jet recording, ink cartridge for ink jet recording, ink jet recording apparatus and recorded article | Chemistry; Metallurgy | 38 | Expired |
| US6786588B2 | Pretreatment liquid for recording material and image recording method using the pretreatment liquid | Emerging Cross-Sectional Technologies | 31 | Expired |
| US7284851B2 | Inkjet recording ink, recording process and recording apparatus | Chemistry; Metallurgy | 31 | Expired |
| US7810919B2 | Recording ink, ink cartridge, ink record, inkjet recording apparatus, and inkjet recording method | Emerging Cross-Sectional Technologies | 26 | Expired |
| US7094813B2 | Ink-jet recording ink, ink-jet recording ink set, ink cartridge, ink-jet printer, and ink-jet printing method | Chemistry; Metallurgy | 25 | Expired |
| US5736286A | Method for recycling image-deposited recording material and liquid composition for use with the recycling method | Performing Operations; Transporting | 24 | Expired |
| US7682011B2 | Recording ink, ink cartridge, ink record, inkjet recording apparatus and inkjet recording process | Chemistry; Metallurgy | 24 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.