US3814907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coin operated telephone set employing electronic totalizer
Assignee: AT&T Inc
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Filing: 1972-05-30
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Granted: 1974-06-04
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Expires: 1992-05-30
Abstract
Abstract An electronic totalizer for coin operated apparatus combines a plurality of flip-flop logic stages into a ripple counter arrangement that is gated to count-up on coin deposits and to count-down when the coin deposit signal is generated. A variable speed multivibrator controls the coin deposit signals. In a coin telephone embodiment the totalizer is employed in combination with a signal oscillator and additional logic circuitry.
Inventors
- 👤 J Edington
- 👤 M Warnock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:21
CPC Classifications
G; G07; G07F; G07F5/00; G07F5/20; G07F5/22; H; H04; H04M; H04M17/00; H04M17/02; H04M17/023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
A coin operated telephone set having terminals connectable to a telephone line comprising, in combination: a speech network, an equalizer circuit, a coin deposit signal oscillator, and a combination electronic totalizer and logic control circuit connected in parallel across said terminals; said totalizer including a solid state device ripple counter circuit; means responsive to the deposit of a coin for initiating upcounting by said counter; first means for controlling the generation of readout signals by said oscillator; second means for controlling the repetition rate of said readout signals; third means for controlling whether the totalizer reads out or stores coin deposit information; fourth means for initiating count-down operation of said totalizer simultaneously with said generation of said readout signals; each of said first, second, third and fourth means including a respective portion of said logic control circuit and a common multifunction multivibrator.
Claim 2
Dependent Claim
142 words
A coin operated telephone set having terminals connectable to a telephone line comprising, in combination: a speech network, an equalizer circuit, a coin deposit signal oscillator, and a combination electronic totalizer and logic control circuit connected in parallel across said terminals; said totalizer including a solid state device ripple counter circuit; means responsive to the deposit of a coin for initiating upcounting by said counter; first means for controlling the generation of readout signals by said oscillator; second means for controlling the repetition rate of said readout signals; third means for controlling whether the totalizer reads out or stores coin deposit information; fourth means for initiating count-down operation of said totalizer simultaneously with said generation of said readout signals; each of said first, second, third and fourth means including a respective portion of said logic control circuit and a common multifunction multivibrator.
Claim 3
Dependent Claim
17 words
Apparatus in accordance with claim 1 wherein said counter comprises a combination of IGFET toggle flip-flop circuits.
Claim 4
Dependent Claim
124 words
A coin operated telephone set comprising, in combination: a pair of terminals connectable to a telephone line; a speech network, an equalizer circuit, a coin deposit signal generator and an electRonic coin totalizer; first, second, third and fourth means for connecting said network, said equalizer circuit, said generator and said totalizer, respectively across said terminals; said totalizer including a plurality of toggle flip-flops and logic control circuitry; means responsive to the deposit of coins for initiating count-up action by said flip-flops; said logic control circuitry including a multifunction multivibrator circuit for initiating the operation of said generator, for controlling the repetition rate of readout signals from said generator and for initiating count-down operating of said totalizer simultaneously with said generation of said readout signals.
Claim 5
Dependent Claim
124 words
A coin operated telephone set comprising, in combination: a pair of terminals connectable to a telephone line; a speech network, an equalizer circuit, a coin deposit signal generator and an electRonic coin totalizer; first, second, third and fourth means for connecting said network, said equalizer circuit, said generator and said totalizer, respectively across said terminals; said totalizer including a plurality of toggle flip-flops and logic control circuitry; means responsive to the deposit of coins for initiating count-up action by said flip-flops; said logic control circuitry including a multifunction multivibrator circuit for initiating the operation of said generator, for controlling the repetition rate of readout signals from said generator and for initiating count-down operating of said totalizer simultaneously with said generation of said readout signals.
Claim 6
Dependent Claim
32 words
Apparatus in accordance with claim 3 wherein each of said first, second and third means comprises a respective transitor switch, each of said switches being directly controlled by an IGFET logic element.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |