Ricoh Co Ltd
Ricoh Co LActive Patents
1
Total Holdings
17
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US20040004644A1 | Color image processing apparatus, color image forming metho… | Expired / Lapsed | 2003-05-29 | — | 16 | Details |
| JPS5835511A | liquid crystal display element | Expired / Lapsed | 1981-08-27 | — | 0 | Details |
| US8483598B2 | Electrophotographic image forming method and apparatus with… | Active / In Force | 2010-04-12 | 2013-07-09 | 20 | Details |
| US5144617A | Optical information read/write apparatus | Expired / Lapsed | 1990-11-08 | 1992-09-01 | 11 | Details |
| US4809016A | Inkjet interlace printing with inclined printhead | Expired / Lapsed | 1987-03-02 | 1989-02-28 | 18 | Details |
| US4580121A | Magnet roll and method for manufacturing the same | Expired / Lapsed | 1984-01-30 | 1986-04-01 | 22 | Details |
| US4533959A | Picture processing apparatus | Expired / Lapsed | 1982-11-18 | 1985-08-06 | 5 | Details |
| US4519695A | Image density control method for electrophotography | Expired / Lapsed | 1983-02-07 | 1985-05-28 | 5 | Details |
| US4485408A | Halftone processing method for digital facsmile apparatus | Expired / Lapsed | 1982-07-07 | 1984-11-27 | 7 | Details |
| US4337394A | Mark means for adjusting the position of solid-state line i… | Expired / Lapsed | 1980-07-08 | 1982-06-29 | 9 | Details |
| US4300144A | Multiple-nozzle ink-jet recording apparatus | Expired / Lapsed | 1979-10-18 | 1981-11-10 | 4 | Details |
| US4277162A | Electrophotographic apparatus comprising density sensor mea… | Expired / Lapsed | 1979-07-12 | 1981-07-07 | 17 | Details |
| US4256401A | Image density adjustment method and apparatus | Expired / Lapsed | 1979-01-08 | 1981-03-17 | 12 | Details |
| US4173402A | Optoelectronic sensing apparatus | Expired / Lapsed | 1978-03-06 | 1979-11-06 | 11 | Details |
| US3770344A | Light source system for overhead projectors | Expired / Lapsed | 1970-05-19 | 1973-11-06 | 13 | Details |
| US3504972A | Exposure adjusting apparatus for a duplicator | Expired / Lapsed | 1967-09-28 | 1970-04-07 | 0 | Details |
| US3299272A | Photosensitive system for taking out desired portions of re… | Expired / Lapsed | 1964-02-06 | 1967-01-17 | 2 | Details |