US5734978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile telephone with function to prevent illegal use and method and system for preventing illegal use of mobile telephone using the function
Assignee: NEC Corp
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Filing: 1995-12-15
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Granted: 1998-03-31
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Expires: 2015-12-15
Abstract
Abstract In order to prevent illegal use of a mobile telephone, a call is repeatedly originated from a telephone or base station to the mobile telephone over a wireless path. When the call is received by the mobile telephone over the wireless path so that a communication channel is established, a destruction code including a cryptographic data is transmitted from the telephone or base station to said mobile telephone. The mobile telephone receives the destruction code and compares the cryptographic data of the received destruction code with a preset data stored in the mobile telephone to determine whether both the data are matched. When it is determined that both the data are matched, the mobile telephone destroys a telephone functioning information stored in the mobile telephone and necessary for performing communication.
Inventors
- 👤 Tetsuo Hayatake
- 👤 Kazuya Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:52
CPC Classifications
H; H04; H04W; H04W12/00; H04W12/08; H04W12/082; H04B; H04B7/00; H04B7/24; H04B7/26; H04W12/12; H04W12/126; H04W12/02; H04W8/00; H04W8/22; H04W8/24; H04W8/245; H04W88/00; H04W88/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
126 words
A method of preventing illegal use of a mobile telephone, comprising the steps of: repeatedly originating a call to said mobile telephone over a wireless path; when the call is received by said mobile telephone over the wireless path so that a communication channel is established, transmitting a destruction code including a cryptographic data to said mobile telephone; said mobile telephone receiving the destruction code and comparing the cryptographic data of the received destruction code with a preset data stored in said mobile telephone to determine whether both the data are matched; and said mobile telephone destroying a telephone functioning information stored in said mobile telephone when it is determined that both the data are matched, said telephone functioning information being information necessary for performing communication.
Claim 2
Independent Claim
126 words
A method of preventing illegal use of a mobile telephone, comprising the steps of: repeatedly originating a call to said mobile telephone over a wireless path; when the call is received by said mobile telephone over the wireless path so that a communication channel is established, transmitting a destruction code including a cryptographic data to said mobile telephone; said mobile telephone receiving the destruction code and comparing the cryptographic data of the received destruction code with a preset data stored in said mobile telephone to determine whether both the data are matched; and said mobile telephone destroying a telephone functioning information stored in said mobile telephone when it is determined that both the data are matched, said telephone functioning information being information necessary for performing communication.
Claim 3
Dependent Claim
26 words
A method according to claim 1, further comprising the step of issuing from said mobile telephone information indicating that the telephone functioning information has been destroyed.
Claim 4
Dependent Claim
48 words
A method according to claim 1, wherein said call is repeatedly originated from a telephone using an automatic repeat function of the telephone via a switch of a base station, and the destruction code is inputted and transmitted from said telephone to said mobile telephone via the switch.
Claim 5
Dependent Claim
50 words
A method according to claim 3, wherein said telephone is a push phone and the destruction code is transmitted to said mobile telephone in a Dual Tone Multi Frequency (DTMF) signal form, and wherein said mobile telephone includes a DTMF detector for detecting the cryptographic data from the DTMF signal.
Claim 6
Dependent Claim
137 words
A method according to claim 1, wherein said step of repeatedly originating a call comprises the steps of: (a) monitoring a traffic on a switch in a base station to determine whether a traffic level is lower than a threshold level; (b) reading out the cryptographic data and a telephone number associated with the cryptographic data; (c) producing the destruction code from the read out cryptographic data and originating a call from the base station to said mobile telephone via the switch based on the read out telephone number to transmit the produced destruction code to said mobile telephone via the switch; and (d) sequentially repeating said steps (b) and (c) for the cryptographic data which are registered in a table in advance, while it is determined that the traffic level is lower than the threshold level.
Claim 7
Dependent Claim
44 words
A method according to claim 5, further comprising the steps of: informing that the preset data has been destroyed from said mobile telephone to the base station; and deleting the cryptographic data and the associated telephone number from the table in the base station.
Claim 8
Dependent Claim
43 words
A method according to claim 5, wherein the destruction code is transmitted to said mobile telephone in a Dual Tone Multi Frequency (DTMF) signal form, and wherein said mobile telephone includes a DTMF detector for detecting the cryptographic data from the DTMF signal.
Claim 9
Dependent Claim
94 words
A mobile telephone having an illegal use preventing function, comprising: a storage section for storing a telephone functioning information necessary for performing communication and a preset data; a first section for receiving a destruction code when a wireless communication channel is established and comparing the cryptographic data of the received destruction code with the preset data stored in the storing section to determine whether both the data are matched; and a second section for destroying the telephone functioning information stored in said storing section when it is determined that both the data are matched.
Claim 10
Dependent Claim
94 words
A mobile telephone having an illegal use preventing function, comprising: a storage section for storing a telephone functioning information necessary for performing communication and a preset data; a first section for receiving a destruction code when a wireless communication channel is established and comparing the cryptographic data of the received destruction code with the preset data stored in the storing section to determine whether both the data are matched; and a second section for destroying the telephone functioning information stored in said storing section when it is determined that both the data are matched.
Claim 11
Dependent Claim
62 words
A mobile telephone according to claim 8, wherein a first section comprises: a receiving section for receiving a destruction code signal; a detecting section for detecting the cryptographic data from the received destruction code signal; and a comparing section for comparing the detected cryptographic data with the preset data stored in the storing section to determine whether both the data are matched.
Claim 12
Dependent Claim
30 words
A mobile telephone according to claim 9, wherein the destruction code signal is of a Dual Tone Multi Frequency (DTMF) signal type and said detecting section includes a DTMF detector.
Claim 13
Dependent Claim
22 words
A system according to claim 8, further comprising means for issuing an information indicating that the telephone functioning information has been destroyed.
Claim 14
Independent Claim
113 words
A system for preventing illegal use of a mobile telephone, comprising a base station including: a switch; storage means for storing a plurality of sets of telephone number and cryptographic data; destruction instructing means for repeatedly originating a call to said mobile telephone over a wireless path via the switch in accordance with a traffic load on the switch, and for transmitting a destruction code including the cryptographic data for said mobile telephone via the switch, such that a telephone functioning information of said mobile telephone is destructed based on the cryptographic data, when the call is received by said mobile telephone so that a communication channel is established over the wireless path.
Claim 15
Independent Claim
113 words
A system for preventing illegal use of a mobile telephone, comprising a base station including: a switch; storage means for storing a plurality of sets of telephone number and cryptographic data; destruction instructing means for repeatedly originating a call to said mobile telephone over a wireless path via the switch in accordance with a traffic load on the switch, and for transmitting a destruction code including the cryptographic data for said mobile telephone via the switch, such that a telephone functioning information of said mobile telephone is destructed based on the cryptographic data, when the call is received by said mobile telephone so that a communication channel is established over the wireless path.
Claim 16
Dependent Claim
118 words
A system according to claim 12, wherein said destruction instruction means comprises: monitoring means for monitoring a traffic on the switch to determine whether a traffic level is lower than a threshold level; reading means for sequentially reading out the plurality of sets of cryptographic data and telephone number for said mobile telephone from said storage means while it is determined that the traffic level is lower than the threshold level; calling means for originating a call to said mobile telephone via the switch based on the read out telephone number; and transmitting means for producing the destruction code from the read out cryptographic data and transmitting the produced destruction code to said mobile telephone via the switch.
Claim 17
Dependent Claim
44 words
A system according to claim 13, further comprising deleting means for deleting the set of cryptographic data and telephone number for said mobile telephone from said storage means when it is informed from said mobile telephone that the telephone functioning information has been destroyed.
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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) | 2001-03-30 | 2001-09-29 | 2002-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-30 | 2005-09-29 | 2006-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-30 | 2009-09-29 | 2010-03-31 | $7700.00 | Window Closed / Lapsed |