Hiroko Ishikawa
17Patents
4h-index
20Co-inventors
60Inventor score
Filing activity: Mar 20, 1991 → Jan 24, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5304445A | Phthalocyanine composition, process for preparing the same and electrophotographic photoreceptor using the same | Chemistry; Metallurgy | 9 | Expired |
| US5352834A | Electrophotographic member | Physics | 7 | Expired |
| US5626999A | Phthalocyanine composition, process for preparing the same and electrophotographic photoreceptor using the same | Chemistry; Metallurgy | 6 | Expired |
| US5160487A | Electrophotographic member | Physics | 5 | Expired |
| US8727347B2 | Sheet feeding apparatus | Performing Operations; Transporting | 4 | Active |
| US8284465B2 | Image scanner, and method and computer readable medium therefor | Electricity | 4 | Active |
| US5403958A | Electrophotographic member | Physics | 3 | Expired |
| US8085414B2 | Image forming device configured to execute scan-to-memory and direct print functions when connected to an external device | Electricity | 3 | Active |
| US5494767A | Phthalocyanine composition, process for preparing the same and electrophotographic photoreceptor using the same | Chemistry; Metallurgy | 2 | Expired |
| US8411336B2 | Image reader, image forming device having the same, and computer-readable storage medium for the same | Electricity | 1 | Active |
| US8928959B2 | Image reading apparatus facilitating jam clear | Electricity | 1 | Active |
| US8970927B2 | Image reading apparatus | Electricity | 1 | Active |
| US5382687A | Enamine derivatives | Physics | 1 | Expired |
| US5272030A | Electrophotographic member comprising enamine derivatives | Physics | 0 | Expired |
| US8643889B2 | Image reader | Electricity | 0 | Active |
| US8184306B2 | Operate light source of reading unit of a multifunction peripheral device according to valid instructive keys | Electricity | 0 | Active |
| US9360595B2 | Antifog optical article and manufacturing method thereof | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.