Hisao Okamoto
19Patents
8h-index
44Co-inventors
72Inventor score
Filing activity: Nov 2, 1979 → Feb 19, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6521038B2 | Near-infrared reflecting composite pigments | Chemistry; Metallurgy | 76 | Expired |
| US7508619B2 | Magnetic head and magnetic disc drive | Physics | 37 | Active |
| US5905101A | Ablator compositions | Chemistry; Metallurgy | 21 | Expired |
| US7920359B2 | Magnetic recording apparatus with correlated main magnetic pole-to-shields spacing and main magnetic pole-to-medium layers spacing | Physics | 17 | Active |
| US6623556B2 | Near-infrared transmitting black azo pigments | Chemistry; Metallurgy | 15 | Expired |
| US6821334B2 | Process for producing sulfonated solid particles | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5961711A | Pigment dispersant, pigment dispersion, and pigment dispersion for color filter | Physics | 10 | Expired |
| US4424085A | Composite solid propellant containing FeOOH as burning rate modifier | Chemistry; Metallurgy | 8 | Expired |
| US6302953A | Pigment dispersions for color filters, fabrication process of color filters, and color filters | Chemistry; Metallurgy | 8 | Expired |
| US6299676A | Pigment dispersants, pigment dispersions and writing or recording pigment inks | Chemistry; Metallurgy | 7 | Expired |
| US6471766B2 | Pigment dispersants and pigment compositions containing the same | Chemistry; Metallurgy | 6 | Expired |
| US6726762B2 | Finely divided pigments and coloring compositions | Chemistry; Metallurgy | 6 | Expired |
| US4302258A | Composite propellant with 0.2.mu. or smaller metal fuel | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4369710A | End-burning gas-generating composition grain containing intertwisted wires | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US4638052A | Azo-pigment containing hydroxy naphthoic acid amide and an iminooxoisoindolenine components | Chemistry; Metallurgy | 1 | Expired |
| US7611572B2 | Pixel-forming colorant compositions and their use | Physics | 1 | Active |
| US9822266B2 | Near infrared-reflecting/transmitting azo pigment, method for manufacturing near infrared-reflecting/transmitting azo pigment, colorant composition using said azo pigments, item-coloring method and colored item | Chemistry; Metallurgy | 1 | Active |
| US7361698B2 | Water-based pigment inks, image recording method, and image recording system | Chemistry; Metallurgy | 0 | Expired |
| US7888398B2 | Pigment | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.