Hiroko Hayashi
41Patents
14h-index
72Co-inventors
84Inventor score
Filing activity: May 19, 1993 → Jan 29, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5324349A | Ink compositions for ink jet printing | Chemistry; Metallurgy | 101 | Expired |
| US5503664A | Ink compositions for ink jet printing | Chemistry; Metallurgy | 71 | Expired |
| US6500248B1 | Ink composition for ink-jet recording and method of ink-jet recording | Chemistry; Metallurgy | 50 | Expired |
| US8556400B2 | Inkjet recording ink | Chemistry; Metallurgy | 39 | Active |
| US5769930A | Ink composition for ink jet recording and recording process using same | Chemistry; Metallurgy | 33 | Expired |
| US6767090B2 | Ink set for ink-jet recording | Chemistry; Metallurgy | 32 | Expired |
| US6802893B1 | Ink for ink-jet recording and process for producing the same, ink set for ink-jet recording, and ink cartridge | Chemistry; Metallurgy | 26 | Expired |
| US5948154A | Color ink set for ink-jet recording | Chemistry; Metallurgy | 25 | Expired |
| US6488753B1 | Aqueous pigment dispersion water-base ink composition and recording method using the ink composition | Chemistry; Metallurgy | 24 | Expired |
| US6234601A | Ink jet recording method and apparatus for forming an image on either plain paper or a specialty recording medium | Performing Operations; Transporting | 24 | Expired |
| US6852154B2 | Ink set | Chemistry; Metallurgy | 21 | Expired |
| US5560771A | Color ink composition and color ink jet printing method | Chemistry; Metallurgy | 21 | Expired |
| US5439517A | Black ink composition excellent in black | Chemistry; Metallurgy | 21 | Expired |
| US5753016A | Ink composition excellent in reproduction of black color and ink jet recording method using the same | Chemistry; Metallurgy | 15 | Expired |
| US5798776A | Color ink jet recording method | Physics | 14 | Expired |
| US5647897A | Ink composition for ink jet recording | Chemistry; Metallurgy | 14 | Expired |
| US7307109B2 | Ink-jet recording ink, ink-jet recording ink set, recording method, print, and ink-jet recording apparatus | Chemistry; Metallurgy | 13 | Expired |
| US7303616B2 | Ink composition, ink jet recording method and recorded article | Chemistry; Metallurgy | 12 | Expired |
| US7083669B2 | Ink composition, inkjet recording method using the same and recorded matter | Chemistry; Metallurgy | 12 | Expired |
| US5748208A | Color ink jet recording method | Performing Operations; Transporting | 11 | Expired |
| US6596378B2 | Recording medium and aqueous ink composition | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6599356B2 | Method for manufacturing pigment dispersed liquid, and pigment dispersed liquid, and ink for ink-jet printer recording using said pigment dispersed liquid | Chemistry; Metallurgy | 7 | Expired |
| US5795970A | Mixed disazo-dye composition and black aqueous ink composition containing the same that provides high grade image on print | Chemistry; Metallurgy | 6 | Expired |
| US5616174A | Ink composition and ink jet recording method using the same | Chemistry; Metallurgy | 6 | Expired |
| US7691192B2 | Ink composition, and ink jet recording method and recorded matter using the same | Chemistry; Metallurgy | 4 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.