Communication means with transducer physically spaced from interior wall of secure housing
US4310754A · kind A · utility
37Cited by
7References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1979 |
| Grant date | Jan 12, 1982 |
| Priority date | — |
| Expiry date | Aug 3, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00395
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved input/output channel for linking a computer control unit for an electronic postal meter to input/output units. The invention includes a converter for converting unit-output electrical signals to non-conductive carrier signals and for converting the non-conductive carrier unit-input signals back to electrical signals. Non-conducting means are used to transmit the signals between the meter and the input/output units so that any attempts to interfere with meter operation will, of necessity, involve physical evidence of tampering, observable to an inspector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.