Apparatus and method for security of electric and electronic devices
US4801935A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1988 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Apr 26, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/31
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method having elements and steps selected and arranged to require a timed, coded input for authenticating a code of characters in a set sequence for authorizing user access and having means for emitting a signal or alarm, wherein the system is initialized so as to require matching of representative signals at inhibiting control circuits having an on-state and an off-state so that characters entered sequentially in timed cycles are authenticated as a correct member of a code set in a correct time cycle or disqualified as an unauthentic character. An authentic character is a certain designated character entered in the selected time cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.