Sequential time-base lock system
US3958231A · kind A · utility
Inventor
Key dates
| Filing date | Jul 1, 1974 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Jul 1, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/0069
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electronic, push-button, combination door lock or electronic lock system which can only be activated by an individual having knowledge of a predetermined, arbitrary combination. The invention utilizes a series of sequential time-based logic gates to activate the lock system's devices. The system also includes inherent circuitry: (1) which will reset the system to its initial or ground reset state, in the event of a combination error; (2) which will prohibit the combination from activating the lock system's devices, if the combination is registered too rapidly. Every combination entry, made too quickly, is counted as an input error and resets the lock system; (3) which will tally input error factors and trigger alarm circuits or activate any type of defense system, which the degree of security requires.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.