Telephone network coupler
US4727535A · kind A · utility
12Cited by
6References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1985 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Apr 8, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M7/0096
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An analog coupling device for coupling a telephone to a telephone network circuit while maintaining isolation of the two circuits has an optical emitting element and an optical receiving element in the network circuit. The telephone circuit includes an optical receiving element optically coupled with the network circuit optical emitting element. The telephone circuit optical receiving element has a reversed biased pn junction. The telephone circuit further includes an optical emitting element which is optically coupled with the network optical receiving element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.