Portable radio terminal

• US 6,370,402 B1
• Filed: 02/08/2000
• Issued: 04/09/2002
• Est. Priority Date: 02/19/1999
• Status: Expired due to Fees

• Current Assignee: HTC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hakomori, Tomoko
• Primary Examiner(s): Le, Thanh Cong
• Assistant Examiner(s): Iqbal, Khawar
• Application Number:
  US09/500,770
• Time in Patent Office: 791 Days
• Field of Search: 455/550, 455/551, 455/557, 455/462, 455/463, 455/465, 455/418, 455/410, 455/411, 455/574, 455/343
• US Class Current: 455/550.1
• CPC Class Codes: H04L 63/083 using passwords cryptographic mechanisms or cryptographic arrangements for entity authentication using a predetermined code H04L9/3226
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/082 using revocation of authorisation
• CPC Class Codes: H04W 12/126 Anti-theft arrangements, e.g. protection against subscriber identity module [SIM] cloning
• CPC Class Codes: H04W 12/61 Time-dependent
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

The present invention provides a portable radio terminal comprising an off-memory 5-a in which a power-off time is stored, an on-memory 5-b in which a power-on time is stored, a difference memory 5-c in which a difference between the power-off time and the power-on is stored, a user data registration memory 4, and a portable terminal control unit 3, wherein, when a value stored in the difference memory 5-c reaches a predetermined time, the portable terminal control unit 3 waits for a password to be entered and, in response to the password entered, erases contents of the user data registration memory.

Claims

1. A portable radio terminal comprising:

an off-memory in which a power-off time is stored,

an on-memory in which a power-on time is stored,

a difference memory in which a difference between said power-off time and said power-on is stored,

a user data registration memory, and

a portable terminal control unit,

wherein, when a value stored in said difference memory reaches a predetermined time, said portable terminal control unit waits for a password to be entered and, in response to the password entered, erases contents of said user data registration memory.

2. The portable radio terminal as defined by claim 1 wherein said portable terminal control unit turns on said power after another predetermined time has elapsed after said power is turned off, thereby activating an automatic data erasing system for erasing the contents of said user data registration memory.

3. The portable radio terminal as defined by claim 1 wherein, if the value stored in said difference memory is smaller than the predetermined time, said portable terminal control unit accepts a password up to a predetermined number of times and, if the number of times the password is entered exceeds said predetermined number of times, erases the contents of said user data registration memory.

4. The portable radio terminal as defined by claim 1 wherein said user registration data includes the password.

5. A portable radio terminal comprising:

an off-memory in which a power-off time is stored,

an on-memory in which a power-on time is stored,

a difference memory in which a difference between said power-off time and said power-on is stored,

a user data registration memory, and

a portable terminal control unit,

wherein if a value stored in said difference memory is equal to or larger than a predetermined time when power is turned on, said portable terminal control unit waits for a password to be entered and, in response to the password entered, erases contents of said user data registration memory.

6. The portable radio terminal as defined by claim 5 wherein said portable terminal control unit turns on said power after another predetermined time has elapsed after said power is turned off, thereby activating an automatic data erasing system for erasing the contents of said data registration memory.

7. The portable radio terminal as defined by claim 5 wherein, if the value stored in said difference memory is smaller than the predetermined time, said portable terminal control unit accepts a password up to a predetermined number of times and, if the number of times the password is entered exceeds said predetermined number of times, erases the contents of said user data registration memory.

8. The portable radio terminal as defined by claim 5 wherein said user registration data includes the password.