Koha Co., Ltd.
44Patents
27Active
44Granted
46Portfolio score
Filing activity: Jan 6, 1997 → Oct 4, 2017 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5836676A | Light emitting display apparatus | Emerging Cross-Sectional Technologies | 220 | Expired |
| US6445011B1 | Light-emitting diode | Electricity | 52 | Expired |
| US6872585B2 | LED device and manufacturing method thereof | Electricity | 38 | Expired |
| US7279723B2 | LED lamp | Emerging Cross-Sectional Technologies | 38 | Expired |
| US6977397B2 | Light emitting element and method of making same | Electricity | 34 | Expired |
| US6236382A | Light emitting diode display unit | Electricity | 29 | Expired |
| US6496162B2 | Light emitting diode display unit | Electricity | 23 | Expired |
| US6834977B2 | Light emitting device | Emerging Cross-Sectional Technologies | 19 | Expired |
| US6812481B2 | LED device and manufacturing method thereof | Electricity | 19 | Expired |
| US7608472B2 | Light emitting element and method of making same | Electricity | 12 | Active |
| US6075214A | Push button assembly for a vending machine | Electricity | 11 | Expired |
| US6713877B2 | Light-emitting diode | Electricity | 11 | Expired |
| US7319249B2 | Light emitting element and method of making same | Electricity | 10 | Expired |
| US7629615B2 | Light emitting element and method of making same | Electricity | 6 | Active |
| US9166127B2 | Light source module | Electricity | 4 | Active |
| US10975497B2 | Light emitting device | Electricity | 3 | Active |
| US7285803B2 | Light-emitting diode lamp having a terminal portion with a notch portion | Emerging Cross-Sectional Technologies | 3 | Expired |
| US7977673B2 | Semiconductor layer with a Ga2O3 system | Electricity | 3 | Expired |
| US7524741B2 | Method of forming a low temperature-grown buffer layer, a light emitting element and method of making same, and light emitting device | Electricity | 3 | Expired |
| US9349915B2 | β-Ga2O3-based single crystal substrate | Emerging Cross-Sectional Technologies | 2 | Active |
| US7768029B2 | LED lamp | Emerging Cross-Sectional Technologies | 2 | Active |
| US9431489B2 | β-Ga2O3-based single crystal substrate | Electricity | 2 | Active |
| US9926646B2 | Method for growing B-Ga2O3-based single crystal | Chemistry; Metallurgy | 2 | Active |
| US8592289B2 | Epitaxial wafer, method for manufacturing gallium nitride semiconductor device, gallium nitride semiconductor device and gallium oxide wafer | Electricity | 2 | Active |
| US9634216B2 | Light emitting device | Electricity | 2 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.