Telephone headset
US4175217A · kind A · utility
44Cited by
4References
2Claims
0Family size
Inventor
Key dates
| Filing date | Mar 30, 1978 |
| Grant date | Nov 20, 1979 |
| Priority date | — |
| Expiry date | Mar 30, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone headset including a dialing mechanism for allowing a user to place and receive calls, without being disturbed by loud noises nearby, when the headset is connected to a telephone line. The headset also includes a signaling device for alerting the user to incoming calls when a switch on the headset is in one of two given states. A dial tone is obtained prior to making outgoing calls by placing the switch in its second state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.