Interlocking system with a number of individual key elements
US3936662A · kind A · utility
7Cited by
5References
1Claims
0Family size
Inventor
Key dates
| Filing date | Jan 14, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Jan 14, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/086
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An interlocking system includes a number of individual key elements such as an identity card each of which has a pre-determined code marking consisting of a number of index elements arranged to form a pattern. At least one interlocking device adapted to co-operate with the key elements includes a release element sensitive to radiation as a function of the radiation pattern pre-determined by the code marking on the key element. The interlocking device comprises a radio-active radiation source, a detector and means such as a slot for interposing the coded key element between the radiation source and the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.