Computer-controlled password lock
US4812841A · kind A · utility
Inventor
Key dates
| Filing date | May 26, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | May 26, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/0069
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A computer-controlled password lock system having a user operated keyboard to key in and reset a password. An indicator visually displays at least one code symbol varying with time. A memory device stores a current password including at least two code symbols so that upon entry of a keyed-in password code through the keyboard, one of the stored password code symbols of the current password is replaced by the time varying code symbol and password then compared with the keyed-in password code to generate a lock opening signal when coincidence occurs. In response to non-coincidence, an alerting signal is generated to indicate the incorrect password condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.