US4508345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slot machine with player-friendly bonus game
Assignee: UNIVERSAL A JAPAN CORP KK
•
Filing: 1983-04-20
•
Granted: 1985-04-02
•
Expires: 2003-04-20
Abstract
Abstract A slot machine has a plurality of rotatable reels with an annular series of symbols on the peripheral surfaces thereof. The reels rotate at high speed in an original game and at low speed in an immediately subsequent bonus game and can be brought to a stop, individually, by means of stop switches associated one with each of the reels. Therefore, in the bonus game, the player has an increased chance of causing a prize winning symbol or combination of symbols to appear in the windows in the selectively stopped positions of the reels.
Inventors
- 👤 Kazuo Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:30
CPC Classifications
G; G07; G07F; G07F17/00; G07F17/32; G07F17/34; G07F17/3225; G07F17/3227; G07F17/326; G07F17/3267
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
In a slot machine having a plurality of rotatable reels arranged in side-by-side relationship, a plurality of stop switches associated with each of said reels for causing said reels individually to stop, each reel having an annular series of symbols on the peripheral surface thereof, and motors one individual to each said reel for rotating said reels; the improvement comprising means for the detection of the occurrence of a predetermined symbol or combination of symbols on said reels in the stopped position of said reels in the course of an original game and for emitting a bonus game signal responsive to a said detection to entitle a player to a bonus game immediately following said original game, motor control circuits driving said motors at high speed in a said original game, and means responsive to a said bonus game signal automatically to cause said motor control circuits to drive said motors at low speed in a said bonus game.
Claim 2
Dependent Claim
159 words
In a slot machine having a plurality of rotatable reels arranged in side-by-side relationship, a plurality of stop switches associated with each of said reels for causing said reels individually to stop, each reel having an annular series of symbols on the peripheral surface thereof, and motors one individual to each said reel for rotating said reels; the improvement comprising means for the detection of the occurrence of a predetermined symbol or combination of symbols on said reels in the stopped position of said reels in the course of an original game and for emitting a bonus game signal responsive to a said detection to entitle a player to a bonus game immediately following said original game, motor control circuits driving said motors at high speed in a said original game, and means responsive to a said bonus game signal automatically to cause said motor control circuits to drive said motors at low speed in a said bonus game.
Claim 3
Dependent Claim
13 words
A slot machine as defined in claim 1, said motors being pulse motors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |