Patent US5931948A successfully refreshed from Google Patents.
US5931948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable computer system having password control means for holding one or more passwords such that the passwords are unreadable by direct access from a main processor
Assignee: Toshiba Corp
•
Filing: 1997-09-11
•
Granted: 1999-08-03
•
Expires: 2017-09-11
Abstract
Abstract A portable computer system includes a keyboard for inputting at least a password, and a main CPU for controlling the system operation to perform a data processing. Particularly, the computer system further includes a password control section, holding one or more registered passwords as being unreadable by direct access from the main CPU, for allowing the main CPU to perform the data processing when a password identical to one of the registered passwords held therein is input by the keyboard.
Inventors
- 👤 Toshikazu Morisawa
- 👤 Masayo Yamaki
- 👤 Hiroyuki Tsukada
- 👤 Tohru Mamata
- 👤 Tatsuya Kawawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:54
CPC Classifications
G; G06; G06F; G06F21/00; G06F21/70; G06F21/82; G06F21/83; G06F21/30; G06F21/31; G06F2221/00; G06F2221/21; G06F2221/2113; G06F2221/2141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
144 words
A personal computer comprising: a memory for storing at least one user password and at least one manager password; input means for inputting a password from an operator; determining means for determining whether the input password coincides with either one of the at least one user password stored in said memory or one of the at least one manager password stored in said memory; first assigning means for assigning a first enable operation range corresponding to a functional mode in a case where the determining means determines that the input password coincides with one of the at least one manager password; and second assigning means for assigning a second enable operation range within the functional mode having the first enable operation range in a case where the determining means determines that the input password coincides with one of the at least one user password.
Claim 2
Dependent Claim
144 words
A personal computer comprising: a memory for storing at least one user password and at least one manager password; input means for inputting a password from an operator; determining means for determining whether the input password coincides with either one of the at least one user password stored in said memory or one of the at least one manager password stored in said memory; first assigning means for assigning a first enable operation range corresponding to a functional mode in a case where the determining means determines that the input password coincides with one of the at least one manager password; and second assigning means for assigning a second enable operation range within the functional mode having the first enable operation range in a case where the determining means determines that the input password coincides with one of the at least one user password.
Claim 3
Dependent Claim
81 words
A personal computer according to claim 1, wherein said second assigning means assigns the second enable operation range in order to give a setting right of the at least one user password and of the input password to the operator who input one of the manager password, and in order to give the setting right of the input password except for the setting right of the at least one manager password to the operator who input one of the user passwords.
Claim 4
Dependent Claim
27 words
A personal computer according to claim 2, wherein the setting right indicates an authorization for password storing into said memory, for password deleting, and for password updating.
Claim 5
Dependent Claim
67 words
A personal computer according to claim 2, wherein said second assigning means allows the operator who input one of the at least one manager passwords to change the first enable operation range of the at least one user password, and disables the operator who input one of the at least one user password to change the second enable operation range of the at least one user password.
Claim 6
Dependent Claim
41 words
A personal computer according to claim 1, wherein the functional modes includes at least one of a power save mode, a resume/boot mode, and LCD (Liquid Crystal Display)/CRT (Cathode Ray Tube display mode and an LCD panel black/white inversion display mode.
References Cited (Backward Citations)
US4672572A
Cited
US5115508A
Cited
US5018096A
Cited
JPH02162443A
Cited
US4959860A
Cited
EP0382470A2
Cited
US4942606A
Cited
EP0394834A2
Cited
US5120939A
Cited
JPH0442326A
Cited
US5226080A
Cited
US5175853A
Cited
US5276888A
Cited
US5272754A
Cited
JPH0519886A
Cited
US5212729A
Cited
US5282247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-08-02 | 2003-02-01 | 2003-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-08-02 | 2007-02-01 | 2007-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-08-02 | 2011-02-01 | 2011-08-03 | $7700.00 | Window Closed / Lapsed |