Secure mode answering machine
US5065428A · kind A · utility
11Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 1990 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | May 29, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/6505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A secure answering machine allows both secure and non-secure information to be recorded by incorporating a digital signal processor (DSP) and both a secure and non-secure RAM. The secure RAM is powered entirely by battery. The battery is then connected to the housing of the answering machine such that when the housing is tampered with, the power from the battery is shut off eliminating all information stored on the secure RAM. The secure RAM is only accessed using an encrypting code.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.