Patent US5778313A successfully refreshed from Google Patents.
US5778313A
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US
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Pre-paid cellular telephone system
Assignee: Cellexis International Inc
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Filing: 1995-12-08
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Granted: 1998-07-07
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Expires: 2015-12-08
Abstract
Abstract A pre-pay service unit uses pseudo-numbers to identify subscribers and substitutes actual numbers to complete a call after verification of authenticity and verification of a positive balance in a subscriber's account. The service unit and the cellular telephone exchange data in the process of authentication. For outgoing calls, a cellular telephone first transmits an "800" number and an ANI. The "800" number is the telephone number of the pre-pay service unit, which then requests number actually dialed. The cellular telephone responds with dialed digits, a security code, and status data. If the information is correct, the dialed digits are then passed to a local exchange carrier to complete the call. For incoming calls, a pseudo-number directs the call to the pre-pay service unit, which converts the pseudo-number to the actual telephone number of a subscriber's cellular telephone.
Inventors
- 👤 Douglas V. Fougnies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:10
CPC Classifications
H; H04; H04W; H04W4/00; H04W4/24; H04M; H04M17/00; H04M2215/00; H04M2215/20; H04M2215/2026; H04M2215/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A pre-paid, cellular telephone system comprising: a plurality of subscriber cellular telephones, each telephone capable of auto-answer and silent ring and including internal memory, a microprocessor, and means for transmitting data from said memory; wherein each of said cellular telephones is programmed to transmit a predetermined first telephone number instead of dialed digits, followed by a unique ANI code, on outgoing calls and is programmed to transmit the dialed digits upon request and to include a unique security code with the dialed digits; a pre-pay service unit including a plurality of telephone communication channels; wherein said pre-pay service unit is identified by said first telephone number and wherein said pre-pay service unit is programmed to request said dialed digits for completing an outgoing call after recognizing a subscriber cellular telephone by said ANI code and said security code.
Claim 2
Dependent Claim
138 words
A pre-paid, cellular telephone system comprising: a plurality of subscriber cellular telephones, each telephone capable of auto-answer and silent ring and including internal memory, a microprocessor, and means for transmitting data from said memory; wherein each of said cellular telephones is programmed to transmit a predetermined first telephone number instead of dialed digits, followed by a unique ANI code, on outgoing calls and is programmed to transmit the dialed digits upon request and to include a unique security code with the dialed digits; a pre-pay service unit including a plurality of telephone communication channels; wherein said pre-pay service unit is identified by said first telephone number and wherein said pre-pay service unit is programmed to request said dialed digits for completing an outgoing call after recognizing a subscriber cellular telephone by said ANI code and said security code.
Claim 3
Dependent Claim
21 words
The pre-paid, cellular telephone system as set forth in claim 1 wherein said means for transmitting data includes a DTMF encoder/decoder.
Claim 4
Dependent Claim
20 words
The pre-paid, cellular telephone system as set forth in claim 1 wherein said means for transmitting data includes a modem.
Claim 5
Dependent Claim
24 words
The pre-paid, cellular telephone system as set forth in claim 1 wherein said subscriber cellular telephone scrambles the dialed digits with said security code.
Claim 6
Dependent Claim
25 words
The pre-paid, cellular telephone system as set forth in claim 1 wherein said subscriber cellular telephone transmits said dialed digits and said security code seriatim.
Claim 7
Dependent Claim
70 words
The pre-paid, cellular telephone system as set forth in claim 1 wherein the subscriber cellular telephones are each identified by a unique pseudo-DID number for incoming calls and wherein said pre-pay service unit stores the actual MIN numbers of the subscriber cellular telephones and converts the pseudo-DID digits into the actual MIN of a subscriber cellular telephone to complete an incoming call to the subscriber cellular telephone using the MIN.
References Cited (Backward Citations)
US5404580A
Cited
US5187710A
Cited
US5216703A
Cited
US5396545A
Cited
US5309501A
Cited
US5579376A
Cited
US5353335A
Cited
US5550897A
Cited
US5592535A
Cited
US5384825A
Cited
US5408513A
Cited
US5485505A
Cited
US5583918A
Cited
US5509056A
Cited
US5722067A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-07-06 | 2002-01-05 | 2002-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-06 | 2006-01-05 | 2006-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-06 | 2010-01-05 | 2010-07-07 | $7700.00 | Window Closed / Lapsed |