Copal Electronics Co., Ltd.
12Patents
0Active
12Granted
30Portfolio score
Filing activity: Aug 3, 1984 → May 19, 1998
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4807239A | Drive and control circuit for laser diode | Electricity | 13 | Expired |
| US5746515A | Dynamic-pressure gas bearing | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| US4894500A | Rotary selector switch | Electricity | 11 | Expired |
| US4771964A | Fishing reel | Human Necessities | 10 | Expired |
| US5997180A | Circumferential flow type dynamic pressure bearing | Mechanical Engineering; Lighting; Heating | 9 | Expired |
| US4787723A | Ultra-wide angle F-.theta. lens system | Physics | 8 | Expired |
| US4799628A | Level winder for double-bearing fishing reel | Human Necessities | 6 | Expired |
| US4832277A | Fishing reel | Human Necessities | 5 | Expired |
| US4712084A | Potentiometer | Electricity | 5 | Expired |
| US4627303A | Variable resistance device | Emerging Cross-Sectional Technologies | 3 | Expired |
| US4788393A | DIP rotary code switch | Electricity | 3 | Expired |
| US4839627A | Variable resistor | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.