Electronic slot machine
US4099722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1975 |
| Grant date | Jul 11, 1978 |
| Priority date | — |
| Expiry date | Jul 30, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F17/3241
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic slot machine employing solid state circuitry of modular design, simplifying maintenance to the tasks of module replacement, changing lamps and possibly clearing a coin jam. A coin detector creates a jam condition upon any malfunction during coin insertion. A high frequency clock drives a multistage counter which is decoupled from the clock either upon insertion of the proper number of coins (in an automatic machine) or upon the operation of the conventional operating handle which is activated by coin entry. A stepping motor steps the reels, having a plurality of symbols, while stepping the count in the counter to zero, which count deenergizes the stepping motors. Three-bit binary codes are generated representing the reel symbols in the final output position for any type of machine from three symbol center line to five line criss-cross models. Logical gates decode the symbol combination indicating a payout (if any) and size of payout which is stored in counter means stepped downwardly as coins are dispensed. Test routines and security and function evaluation (SAFE) circuitry are provided to assure proper operation and to positively identify the malfunction, which is pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.