Hitachi Lighting, Ltd.
4Patents
1Active
4Granted
30Portfolio score
Filing activity: Apr 14, 1982 → Sep 27, 2006 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4694224A | Lighting apparatus for an electric discharge lamp | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4503359A | Discharge lamp lighting device | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4447763A | Discharge lamp lighting device | Emerging Cross-Sectional Technologies | 6 | Expired |
| US7671534B2 | Liquid crystal display, illuminant module and its manufacturing method | Physics | 1 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.