Richard E. Callahan
6Patents
3h-index
8Co-inventors
50Inventor score
Filing activity: Jan 28, 1976 → Aug 14, 2009
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4032842A | Spark plug tester ignition system | Electricity | 29 | Expired |
| US4307689A | Glow plug control circuit | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US7825573B2 | 14 mm extension spark plug | Electricity | 11 | Active |
| US7795791B2 | One piece shell high thread spark plug | Electricity | 3 | Active |
| US8164241B2 | Extension-type spark plug | Electricity | 2 | Active |
| US7768183B2 | Extension spark plug | Electricity | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.