Steven Ritchie
9Patents
6h-index
5Co-inventors
56Inventor score
Filing activity: Oct 24, 1980 → Aug 27, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4606545A | Bi-level pinball machine providing interlevel ball travel | Human Necessities | 133 | Expired |
| US4373725A | Pinball machine having magnetic ball control | Human Necessities | 126 | Expired |
| USD335150S | Trigger handle switch for pinball type games | General | 117 | Expired |
| US4685677A | Automatic replay control system and method for amusement devices | Human Necessities | 46 | Expired |
| US8915434B2 | Fraud prevention | Physics | 24 | Active |
| US6932703B1 | Method and apparatus for a slot machine gaming device simulating a bank robbery | Physics | 13 | Expired |
| US8704633B2 | Fraud prevention | Physics | 3 | Active |
| US10439714B2 | Mobile device for optical wireless communication | Electricity | 2 | Active |
| US10855369B2 | Mobile device for optical wireless communication | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.