Post office box monitoring system
US4314102A · kind A · utility
15Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1980 |
| Grant date | Feb 2, 1982 |
| Priority date | — |
| Expiry date | Feb 13, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system for detecting the presence of mail in a post office box. A post office box holder calls a telephone number which accesses a computer. The computer contains data representative of the presence or absence of letters in a plurality of post office boxes. If the box to which the caller refers is occupied, a series of tone pulses is transmitted to the caller by a tone generator under the direction of the computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.