Line status indicator for use with telephones sharing a single line
US5533117A · kind A · utility
14Cited by
10References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1993 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Aug 3, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/82
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention relates to home telephone accessary and more specifically to an accessary that turns on a green light and a buzzer when the home phone line is open, and a red light when the line is in use. This invention is useful especially for those who share one telephone line with many other people.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.