US3794770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coin telephone sets
Assignee: Anritsu Corp
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Filing: 1971-10-18
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Granted: 1974-02-26
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Expires: 1991-10-18
Abstract
Abstract This coin telephone set uses polarity reversal of both a speech current from the central office equipment and a source of rectified alternating current to enable a local call, direct distance dialed call, operator-handled toll call, a delay call or an emergency call by simultaneous use of coins of low value and coins of high value.
Inventors
- 👤 Y Tabiichi
- 👤 Y Yamazaki
- 👤 Y Sato
- 👤 T Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:30
CPC Classifications
H; H04; H04M; H04M17/00; H04M17/02; H04M17/023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
373 words
In a coin operated telephone, set of the type utilizing polarity reversal of speech current sent from a central office equipment and a source of supply potential for enabling a local call, a direct dialing long distance call, an operator-handled toll call, a delayed call and an emergency call, the improvement which comprises means providing at least two independent coin receiving slots and coin passages for the use of coins of low value and coins of high value, low value coin discriminating means supplied through said low value coin slot and passage for discriminating low value coins inserted into said telephone set, low value coin storage means supplied from said low value coin discriminating means for storing normal low value coins discriminated by said low value coin discriminating means, means for collecting and returning under selected conditions, low value coins stored in said low value storage means, high value coin discriminating means supplied through said high value coin slot and passage comprising selectively operable electromagnetic detection coil means for discriminating the material composition of high value coins inserted into said telephone set, high value coin storage means supplied from said high value coin discriminating means for storing normal high value coins discriminated by said high value coin discriminating means, means for collecting and returning under selected conditions, high value coins stored in said high value coin storage means, coin detecting means for detecting the presence or absence of coins in said low and high value coin storage means, respectively, said coin detecting means serving to establish speech circuit means when low value and/or hgh value coins are present in either said low or high value coin storage means, coin collect signal receiving means for receiving coin collect signals transmitted from said central office equipment in respne to a called party removing his telephone set from its hook, call discriminating means which discriminates the type of call in accordance with the coin collect signal, and control means responsive to said coin detecting means, said coin collect signal receiving means and said call discrminating means and controlling operation of said low and high value coin collecting and returning means, respectively, for collecting the appropraite fare for a placed call and returning any unused inserted coins.
Claim 2
Dependent Claim
373 words
In a coin operated telephone, set of the type utilizing polarity reversal of speech current sent from a central office equipment and a source of supply potential for enabling a local call, a direct dialing long distance call, an operator-handled toll call, a delayed call and an emergency call, the improvement which comprises means providing at least two independent coin receiving slots and coin passages for the use of coins of low value and coins of high value, low value coin discriminating means supplied through said low value coin slot and passage for discriminating low value coins inserted into said telephone set, low value coin storage means supplied from said low value coin discriminating means for storing normal low value coins discriminated by said low value coin discriminating means, means for collecting and returning under selected conditions, low value coins stored in said low value storage means, high value coin discriminating means supplied through said high value coin slot and passage comprising selectively operable electromagnetic detection coil means for discriminating the material composition of high value coins inserted into said telephone set, high value coin storage means supplied from said high value coin discriminating means for storing normal high value coins discriminated by said high value coin discriminating means, means for collecting and returning under selected conditions, high value coins stored in said high value coin storage means, coin detecting means for detecting the presence or absence of coins in said low and high value coin storage means, respectively, said coin detecting means serving to establish speech circuit means when low value and/or hgh value coins are present in either said low or high value coin storage means, coin collect signal receiving means for receiving coin collect signals transmitted from said central office equipment in respne to a called party removing his telephone set from its hook, call discriminating means which discriminates the type of call in accordance with the coin collect signal, and control means responsive to said coin detecting means, said coin collect signal receiving means and said call discrminating means and controlling operation of said low and high value coin collecting and returning means, respectively, for collecting the appropraite fare for a placed call and returning any unused inserted coins.
Claim 3
Dependent Claim
42 words
A coin operated telephone set according to claim 1, further including means determining the order of preference for collection between the low value and high value coin collecting operations, respectively, and means for automatically rejecting and returning coins determined to be counterfeit.
Claim 4
Dependent Claim
240 words
A coin operated telephone system according to claim 1 wherein the electromagnetic detection coil means is disposed in said high value coin storage means for temporarily subjectinG high value coins stored there by said high value coin discriminating means to an electromagnetic field for determining whether they hae a specified impedance in accordance with the known specific impedance characteristic of genuine high value coins, a bridge circuit connecting one end of said electromagnetic coil to one end of a reference coil having a predetermined impedance equal to the specified impedance corresponding to that of genuine high value coins and connecting the other end of said electromagnetic detection coil to the other end of said reference coil through proportionally arm elements, a filter circuit connected to the output of said bridge circuit, an amplifier for amplifying any unbalance output signal from said filter circuit, and a feedback loop feeding the output of said amplifier circuit to said bridge circuit to form an oscillation system, whereby with high value coins of genuine material subjected to said electromagnetic detection coil, the impedance of said electromagnetic detection coil balances that of said reference coil and results in a first operating condition for said oscillation system and upon suitable coins made of different material being subjected to said electromagnetic detection coil an unbalance of the impedances of said electromagnetic detection coil and said reference coil causes a second different operating condition for said oscillation system.
Claim 5
Dependent Claim
97 words
A coin operated telephone set according to claim 3 further including filter and rectifying circuit means coupled to said feedback loop whereby the output voltage of said bridge circuit is smoothed and converted into a DC voltage and used for identifying counterfeit coins made of different material from genuine coins, said bridge circuit being provided with the same number of reference coils as there are types of coins to be discriminated as to discriminate normal coins from counterfeit coins of the same dimension and of different material, and means for selecting appropriate ones of said reference coils.
Claim 6
Dependent Claim
208 words
A coin operated telephone set according to claim 1, wherein said high value and low vlaue coin collecting and returning control means each includes counting circuit means for counting a periodic coin collect signal representative of one low value coin unit call authorized by said central office equipment, said high value coin counting circuit means serving to collect high value coins, in accordance with the coin collect signal from said central office equipment during a direct distance dialing call when high value coins are inserted and said coin collect signal is used to count said high value coins through said coin collecting and returning control means one by one until the counted value reaches the telephone rate payed in terms of high value coins and which have already been inserted in the coin receiving slot, thereby permitting continuous speech without interruption and additional insertion of coins and said central office equipment is not needed to discriminate the types of collected coins and to send coin collect signals having a period different from or larger than the coin collect signal representative of one low value coin unit call whereby high value coins can be used for extended continuous phone calls without any modification of the conventional central office equipment.
Claim 7
Dependent Claim
128 words
A coin operated telephone set according to claim 5, further including preferential collection means determining the order of preference for collection between low value and high value coins stored in said low value coin storage means and high value coin collection operations respectively, high value coins stored in said high value coin storing means, said preferential collection means to collect low value coins followed by collection of high value coins and including means, operative when the collection of high value coins is followed by an additional insertion and storage of a low value coin in said low value storage means, for collecting said additionally inserted and stored low value coin only afTer the collected high value coins equal the telephone toll paid in terms of high value coins.
Claim 8
Dependent Claim
256 words
A coil operated telephone set according to claim 6 wherein said electromagnetic detection coil means for discriminating the material composition of the high value coins is disposed in said high value coin storage means for temporarily subjecting high value coins stored there by said high value coin whether they have a specified impedance in accordance with the known specific impedance characteristic of genuine high value coins, a bridge circuit connecting one end of said electromagnetic coil to one end of a reference coil having a predetermined impedance equal to the specified impedance corresponding to that of genuine high value coins and connecting the other end of said electromagnetic detection coil to the other end of said reference coil through proportionality arm elements, a filter circuit connected to the output of said bridge circuit, an amplifier for amplifying any unbalance output signal from said filter circuit, and a feedback loop feeding the output of said amplifier circuit to said bridge circuit to form an oscillation system, whereby with high value coins of genuine material subjected to said electromagnetic detection coil the impedance of said electromagnetic detection coil balances that of said reference coil and results in minimal output voltage from said bridge circuit and a non-oscillation condition for said feedback loop, and upon unsuitable coins made of different material being subjected to said electromagnetic detection coil, an unbalance of the impedances of said electromagnetic detection coil and said reference coil causes increased output voltage from said bridge circuit resulting in an oscillation condition of said feedback loop.
Claim 9
Dependent Claim
98 words
A coin operated telephone set according to claim 7, further including filter and rectifying circuit means coupled to said feedback loop whereby the output voltage of said bridge circuit is smoothed and converted into a DC voltage and used for identifying counterfeit coins made of different material from genuine coins, said bridge circuit being provided with the same number of reference coils as there are types of coins to be discriminated so as to discriminate normal coins from counterfeit coins of the same dimension and of different material, and means for selecting appropriate ones of said reference coils.
Claim 10
Dependent Claim
143 words
A coin operated telephone set according to claim 1 wherein said call discriminating means includes first discriminating circuit means and second discriminating circuit means, said first discriminating circuit means discriminating between a direct distance dialing call and other calls in accordance with the coil collect signal sent from said central office equipment, said second discriminating circuit means discriminating a terminating call in accordance with a call signal of known frequency sent from said central office equipment, and said coin collecting and returning means is responsive to said first and second discriminating means when the direct distance dialing call is discriminated from other calls by said first discriminating circuit and the terminating call is discriminated by said second discriminating circuit to store inserted coins in a coin receptacle directly without storage in said low value coin storage means and high value coin storage means.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |