Visual ring indicator
US4002853A · kind A · utility
0Cited by
4References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1975 |
| Grant date | Jan 11, 1977 |
| Priority date | — |
| Expiry date | Aug 13, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An automatic visual ring indicator for telephone station sets which includes a mechanical indicator element viewable through a window in the telephone housing. The indicator element assumes its on position in response to the ringing action of the telephone. The off position of the indicator element is resumed in response to switchhook motion as in removal of the telephone handset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.