John E. Hart
4Patents
1Active
4Granted
32Portfolio score
Filing activity: Nov 1, 1979 → Mar 24, 2016
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4384317A | Solar powered lighting system | Emerging Cross-Sectional Technologies | 78 | Expired |
| US4477204A | Cast concrete element for underground tubular structure | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6494708B1 | Safety device for candles | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US10294046B2 | Loading system | Performing Operations; Transporting | 5 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.