Copyer Co., Ltd.
47Patents
0Active
47Granted
34Portfolio score
Filing activity: Aug 18, 1975 → Jan 23, 2002
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4315982A | Styryl pyrazoline compounds, process for production thereof, and electrophoto graphic material comprising said compounds | Physics | 48 | Expired |
| US6301454A | Fixing heater controlling method and an image forming device | Physics | 44 | Expired |
| US4551404A | Disazo electrophotographic photosensitive member | Physics | 31 | Expired |
| US6302602A | Apparatus for cutting-recording medium | Emerging Cross-Sectional Technologies | 26 | Expired |
| USD400917S | Plotter | General | 25 | Expired |
| US4554231A | Electrophotographic photosensitive member | Physics | 24 | Expired |
| US6084607A | Ink-type image forming device with mounting-position-error detection means for detecting deviations in position of recording heads | Performing Operations; Transporting | 19 | Expired |
| US4471040A | Electrophotographic disazo photosensitive member | Physics | 17 | Expired |
| US6348697B1 | Media detection method and device | Performing Operations; Transporting | 16 | Expired |
| US6409301B1 | Ink-jet image forming device | Performing Operations; Transporting | 16 | Expired |
| US4446217A | Electrophotographic photosensitive member having a hydrazone containing layer | Physics | 13 | Expired |
| US6104897A | Image forming apparatus | Physics | 12 | Expired |
| US4286862A | Means for separating a copying paper from a sensitive body in an electronic copying machine | Emerging Cross-Sectional Technologies | 12 | Expired |
| US6091928A | Rolled paper supply device for image forming apparatuses | Physics | 11 | Expired |
| US6409322B1 | Ink supply apparatus and ink filling method | Performing Operations; Transporting | 11 | Expired |
| US4390268A | Cleaning device for transferring system wet type copying machine | Physics | 10 | Expired |
| US6229983A | Image formation apparatus having controller for cutting recording medium | Performing Operations; Transporting | 10 | Expired |
| US6530639B1 | Image forming device | Performing Operations; Transporting | 9 | Expired |
| US6519441B1 | Roll paper unit having paper path switching member and image forming apparatus employing the same | Physics | 9 | Expired |
| US4268595A | Electrostatic recording material and method for the production thereof | Emerging Cross-Sectional Technologies | 8 | Expired |
| US6266455A | Image processor | Physics | 8 | Expired |
| US4359513A | Electrophotographic light-sensitive disazo compounds having diphenylacrylonitrile group | Physics | 8 | Expired |
| US6120196A | Image forming device using multiple factors to adjust print position | Performing Operations; Transporting | 8 | Expired |
| US4454211A | Electrophotographic photosensitive member with pyrazoline charge transport material | Physics | 7 | Expired |
| US4500619A | Electrophotographic photosensitive member with oxadiazole containing disazo compound | Physics | 6 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.