Hiroshi Umezaki
36Patents
10h-index
55Co-inventors
78Inventor score
Filing activity: Dec 5, 1974 → Feb 27, 2008
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5114437A | Polishing composition for metallic material | Chemistry; Metallurgy | 28 | Expired |
| US6826076B2 | Non-volatile memory device | Physics | 22 | Expired |
| US4288283A | Method of forming a microscopic pattern | Physics | 21 | Expired |
| US4584243A | Abrasive, production thereof and use thereof in magnetic recording medium | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4415262A | Photomask | Physics | 16 | Expired |
| US5382556A | Translucent polycrystalline alumina and process for producing the same | Chemistry; Metallurgy | 14 | Expired |
| US7123498B2 | Non-volatile memory device | Physics | 14 | Expired |
| US4502916A | Process for forming fine patterns | Physics | 13 | Expired |
| US4671993A | Magnetic recording medium | Emerging Cross-Sectional Technologies | 12 | Expired |
| US6639834B2 | Data register and access method thereof | Physics | 11 | Expired |
| US5757592A | Laminated coil for a magnetic head of a disk drive and method for manufacturing the same | Physics | 10 | Expired |
| US6785154B2 | MRAM and access method thereof | Physics | 9 | Expired |
| US4740423A | Abrasive, production thereof and use thereof in magnetic recording medium | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4704266A | Method for producing lithium aluminate powders | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4460412A | Method of making magnetic bubble memory device by implanting hydrogen ions and annealing | Electricity | 7 | Expired |
| US7518814B2 | Magnetic head tester and method of manufacturing magnetic disk drive | Physics | 6 | Active |
| US4344153A | Magnetic bubble memory device and method of fabricating the same | Electricity | 5 | Expired |
| US4650895A | Process for producing high purity metallic compound | Chemistry; Metallurgy | 5 | Expired |
| US7349235B2 | Non-volatile memory device | Physics | 4 | Expired |
| US6992924B2 | Magnetic memory and method for optimizing write current in a magnetic memory | Physics | 4 | Expired |
| US4556582A | Method of fabricating magnetic bubble memory device | Electricity | 4 | Expired |
| US7929255B2 | Magnetic head inspection system, magnetic head inspection method and magnetic disk drive manufacturing method | Physics | 4 | Active |
| US3954958A | Preparation of aluminum hydrate | Chemistry; Metallurgy | 3 | Expired |
| US8125734B2 | Magnetic slider, head gimbal assembly and method for manufacturing the same | Physics | 3 | Active |
| US4503517A | Magnetic bubble memory device | Electricity | 3 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.