US5778313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 12:14
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.
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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 |