Ricoh Research Institute of General Electronics Co., Ltd.
49Patents
0Active
49Granted
38Portfolio score
Filing activity: May 7, 1986 → Feb 25, 1997
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5108843A | Thin film semiconductor and process for producing the same | Emerging Cross-Sectional Technologies | 201 | Expired |
| US5357123A | Light emitting diode array with dovetail | Performing Operations; Transporting | 116 | Expired |
| US5684523A | Optical line printhead and an LED chip used therefor | Performing Operations; Transporting | 106 | Expired |
| US5124543A | Light emitting element, image sensor and light receiving element with linearly varying waveguide index | Electricity | 72 | Expired |
| US4969025A | Amorphous silicon photosensor with oxygen doped layer | Emerging Cross-Sectional Technologies | 63 | Expired |
| US5408113A | High sensitivity improved photoelectric imaging device with a high signal to noise ratio | Electricity | 41 | Expired |
| US5316960A | C-MOS thin film transistor device manufacturing method | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5061974A | Semiconductor light-emitting device of array type | Electricity | 35 | Expired |
| US4883766A | Method of producing thin film transistor | Emerging Cross-Sectional Technologies | 29 | Expired |
| US5448113A | Micro metal-wiring structure having stress induced migration resistance | Electricity | 26 | Expired |
| US4994877A | Photoelectric conversion semiconductor device with noise limiting circuit | Electricity | 25 | Expired |
| US5140397A | Amorphous silicon photoelectric device | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5403673A | Functional thin film member | Electricity | 24 | Expired |
| US5017987A | Contact type image sensor | Electricity | 22 | Expired |
| US5294815A | Semiconductor light emitting device with terraced structure | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4874957A | Contact type image sensor | Electricity | 21 | Expired |
| US4977304A | Linear solid state image sensor | Electricity | 19 | Expired |
| US5101246A | Photo-functional device | Electricity | 18 | Expired |
| US5307200A | Semiconductor optical device having an optical confinement structure | Performing Operations; Transporting | 17 | Expired |
| US5091757A | Semiconductor light emitting array with particular surfaces | Electricity | 16 | Expired |
| US4797890A | Semiconductor light emitting device with vertical light emission | Electricity | 14 | Expired |
| US5362673A | Method of manufacturing a semiconductor light emitting device | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4966821A | Perpendicular magnetic recording medium | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5428227A | Semiconductor light emitting element | Electricity | 12 | Expired |
| US5153750A | Image reading apparatus having a contact type image sensor device | Electricity | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.