John Hatfield
4Patents
1h-index
2Co-inventors
38Inventor score
Filing activity: Sep 21, 1984 → Dec 7, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4536160A | Computer keyboard educational toy | Human Necessities | 13 | Expired |
| US9265998B1 | Golf putter with adjustable counterbalance weight | Human Necessities | 1 | Active |
| US9266000B1 | Golf putter with adjustable counterbalance weight | Human Necessities | 1 | Active |
| US9827472B2 | Golf putter with adjustable counterbalance weight | Human Necessities | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.