Nippon Kogaku K.K.
852Patents
0Active
852Granted
45Portfolio score
Filing activity: Feb 22, 1973 → Nov 19, 1993
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4780617A | Method for successive alignment of chip patterns on a substrate | Physics | 401 | Expired |
| US4465368A | Exposure apparatus for production of integrated circuit | Electricity | 300 | Expired |
| US4652090A | Dispersed iridium based complementary electrochromic device | Physics | 201 | Expired |
| US4782239A | Optical position measuring apparatus | Physics | 198 | Expired |
| US4456931A | Electronic camera | Emerging Cross-Sectional Technologies | 194 | Expired |
| US4619508A | Illumination optical arrangement | Physics | 174 | Expired |
| US4420773A | Electronic photographic camera | Emerging Cross-Sectional Technologies | 166 | Expired |
| US4650983A | Focusing apparatus for projection optical system | Physics | 152 | Expired |
| US4758883A | Electronic picture camera with reduced memory capacity | Electricity | 147 | Expired |
| US4497015A | Light illumination device | Mechanical Engineering; Lighting; Heating | 142 | Expired |
| US4630182A | Illuminating system | Mechanical Engineering; Lighting; Heating | 137 | Expired |
| US4338001A | Telephoto lens system | Physics | 121 | Expired |
| US4558949A | Horizontal position detecting device | Physics | 114 | Expired |
| US4780747A | Projection exposure apparatus | Physics | 105 | Expired |
| USD292985S | Spectacles | General | 99 | Expired |
| US4769750A | Illumination optical system | Physics | 96 | Expired |
| US4293194A | Solid electrochromic element | Electricity | 93 | Expired |
| US4710026A | Position detection apparatus | Physics | 89 | Expired |
| US4468120A | Foreign substance inspecting apparatus | Physics | 86 | Expired |
| US4721972A | Camera having a photo-taking lens barrel movable in the direction of the optic axis | Physics | 85 | Expired |
| US4769523A | Laser processing apparatus | Electricity | 85 | Expired |
| US4666273A | Automatic magnification correcting system in a projection optical apparatus | Physics | 84 | Expired |
| US4531060A | Positioning method | Physics | 81 | Expired |
| US4342905A | Automatic focusing device of a microscope | Physics | 79 | Expired |
| US4677301A | Alignment apparatus | Physics | 77 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.