Keyboard password lock
US5097506A · kind A · utility
39Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 1990 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | May 18, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/31
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A keyboard controller or interface with scans entered key sequences for a key sequence activating a keyboard lock feature. A password and particular hot key are loaded by the system microprocessor. The keyboard interface then scans untl the designated sequence is activated. All keyboard activity is blocked from the system microprocessor until a password sequence is entered. Codes releasing some of the key strokes in the activation sequence are transmitted and normal operation, including activation sequence scanning, resumes. The password mode may be directly activated on command from the system microprocessor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.