Mark D. Ritchie
6Patents
4h-index
7Co-inventors
42Inventor score
Filing activity: Mar 14, 1991 → Sep 15, 1995
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5322283A | Rotary ball receptacle for a pinball game | Human Necessities | 144 | Expired |
| US5405144A | Tilting play feature for a pinball game | Human Necessities | 116 | Expired |
| US5137278A | Amusement device with trading card dispenser | Physics | 57 | Expired |
| US5149093A | Amusement device with trading card dispenser | Physics | 43 | Expired |
| US5497989A | Ball trough for pinball games | Human Necessities | 1 | Expired |
| US5655770A | Pinball solenoid power control system | Human Necessities | 1 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.