Call waiting cancellation device
US5546451A · kind A · utility
21Cited by
10References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 31, 1995 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | May 31, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/32763
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device that links a telecommunication device (for example a data terminal, a telephone instrument, a message terminal or a video terminal) directly to a telephone line for cancellation of a call waiting tone. When an incoming call is received by the linked telecommunication device, the device according to the invention places the interface terminal on hold while maintaining it on line, while a special call waiting cancellation DTMF code such as "*70" is generated and transmitted. Following this action, telecommunication device is returned to the line and the original transmission is allowed to resume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.