Telephone handsets
US4514596A · kind A · utility
3Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1982 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Jun 1, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone subscriber subset including a transducer for generating audible signalling tone information in which the signalling tones are received at the input terminal as substantially sinusoidal electrical waveforms and including a converter within the handset for conversion of the signalling tones to a substantially non-sinusoidal electrical waveforms before feeding to the transducer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.