Push button phone capable of sending to the telephone line alphabetical characters
US4918721A · kind A · utility
40Cited by
3References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 24, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Aug 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/066
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A pushbutton telephone is used by a calling party to transmit both upper and lower case alphabetical characters on the telephone lines. Upper and lower case characters are selected for transmission by the caller by pressing combinations of keys, including a special key (#) or (*), of a telephone keypad. The combination of keys successively pressed is detected by a receiving terminal at the station of the called party, and a signal representing a corresponding upper case or lower case letter is decoded by the terminal and displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.