Ralph E. Johnson
13Patents
13h-index
2Co-inventors
64Inventor score
Filing activity: Oct 23, 1987 → Sep 27, 2001
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4823242A | Double switch miniature flashlight | Electricity | 97 | Expired |
| US5008785A | Rechargeable miniature flashlight | Electricity | 67 | Expired |
| US5121308A | Miniature flashlight with two switches | Electricity | 62 | Expired |
| US4885668A | Heat shield | Mechanical Engineering; Lighting; Heating | 45 | Expired |
| US5528472A | Rechargeable miniature flashlight | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| USD303107S | Miniature flashlight recharger | General | 28 | Expired |
| US5267130A | Rechargeable miniature flashlight | Electricity | 25 | Expired |
| US5836672A | Rechargeable miniature flashlight | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US5455752A | Rechargeable miniature flashlight | Electricity | 22 | Expired |
| US5193898A | Rechargeable miniature flashlight | Electricity | 22 | Expired |
| US6296368A | Rechargeable miniature flashlight | Mechanical Engineering; Lighting; Heating | 19 | Expired |
| US6457840B2 | Rechargeable miniature flashlight | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US6086219A | Rechargeable miniature flashlight | Mechanical Engineering; Lighting; Heating | 17 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.