Slot machine
US4721307A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 1987 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Mar 17, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F17/3244
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A slot machine having a plurality of symbol series disposed side by side and movable lengthwise independently, selects a combination of symbols on a winning line which is judged as to whether it coincides with any one of the predetermined prize-winning symbol combinations to pay out a predetermined number of coins. At least one of the symbol series includes a special mark as distinguished from the symbols. When the slot machine selects any one of the predetermined prize-winning symbol combinations, and one of the symbols of this combination is replaced with the special mark, the slot machine pays out coins as a special dividend the number of which is larger than that of coins to be paid out upon the one predetermined prize-winning symbol combination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.