Kazuo Okada
296Patents
37h-index
170Co-inventors
93Inventor score
Filing activity: Jul 16, 1971 → May 14, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5152529A | Game machine | Physics | 573 | Expired |
| US5178390A | Game machine | Physics | 542 | Expired |
| US4556140A | Method and apparatus for discriminating coins or bank notes | Physics | 270 | Expired |
| US4573681A | Slot machine with random number generation | Physics | 269 | Expired |
| US4718672A | Slot machine | Physics | 255 | Expired |
| US4753625A | Coin pay-out apparatus | Physics | 233 | Expired |
| US6287194A | Gaming machine | Physics | 221 | Expired |
| US5127651A | Slot machine | Physics | 220 | Expired |
| US5074559A | Slot machine | Physics | 216 | Expired |
| US4721307A | Slot machine | Physics | 204 | Expired |
| US4657256A | Slot machine with win/loss biasing means | Physics | 180 | Expired |
| US5083785A | Win control method and apparatus for game machines | Physics | 162 | Expired |
| US6790142B2 | Advertisement distribution system and server | Physics | 145 | Expired |
| US5887110A | Video data playback system using effective scheme for producing coded video data for fast playback mode | Electricity | 132 | Expired |
| US6937298B2 | Gaming machine having a protective member covering drive unit and at least a portion of the light emission means | Physics | 129 | Expired |
| US7118601B2 | Parallel linkage and artificial joint device using the same | Emerging Cross-Sectional Technologies | 125 | Expired |
| US4508345A | Slot machine with player-friendly bonus game | Physics | 125 | Expired |
| US4772023A | Slot machine | Physics | 122 | Expired |
| US4679789A | Video game apparatus with automatic skill level adjustment | Human Necessities | 120 | Expired |
| US5024439A | Slot machine | Physics | 118 | Expired |
| US7097560B2 | Gaming apparatus with a variable display unit and concealing unit to temporarily conceal the variable display unit | Physics | 116 | Expired |
| US7220181B2 | Gaming machine having transparent LCD in front of variable display device, the LCD having a light-guiding plate and a reflective plate | Physics | 109 | Expired |
| US4492379A | Reel type slot machine | Physics | 104 | Expired |
| US7159865B2 | Gaming apparatus | Physics | 98 | Expired |
| US4700948A | Slot machine with playing card symbols | Human Necessities | 94 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.