Registre Brevet OPIC
Numéro de document 02082916
Statut Inactif
Date de dépôt 1992-11-13
Date de disponibilité au public 1993-08-27
Date de publication 1993-08-27
Date d'octroi 1996-04-16
Propriétaire LENOVO (SINGAPORE) PTE. LTD. (Singapour)
  • Blackledge, John Wiley Jr.
  • Clarke, Grant Leach Jr.
  • Dayan, Richard Alan
  • Le, Kimthanh Do
  • Mccourt, Patrick Edward
  • Mittelstedt, Matthew Todd
  • Moeller, Dennis Lee
  • Newman, Palmer Eugene
  • Randall, Dave Lee
  • Yoder, Joanna Berger


This invention relates to personal computer systems and, more particularly, to such a system having security features enabling control over access to data retained in such a system. In particular, a personal computer system in accordance with this invention has a normally closed enclosure, an erasable memory element for selective activation to active and inactive states and for receiving and storing a privileged access password when in the active state, an option switch operatively connected with the erasable memory element for setting the erasable memory element to the active and inactive states, a tamper detection switch operatively connected with the erasable memory element for detecting opening of the enclosure and for clearing any stored privileged access password from the erasable memory element in response to any switching of the tamper switch, and a system processor operatively connected with the erasable memory element for controlling access to at least certain levels of data stored within the system by distinguishing between the active and inactive states of the memory element and between entry and non-entry of any stored privileged access password.

Classes IPC  ?

  • G06F 12/14 - Protection against unauthorised use of memory
  • G06F 21/00 - Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity