Apparatus and method for automatically returning a telephone set to an on-hook condition
US5606593A · kind A · utility
16Cited by
8References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1994 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Nov 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/14
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An apparatus that after a time period settable by the user automatically returns an off-hook telephone to an on-hook condition. This apparatus thus electrically hangs up a telephone handset that is inadvertently left off-hook and allows normal handling of outgoing and incoming calls at other telephone extensions and in some embodiments, even allows calls to ring-in to the telephone having the inadvertently off-hook handset. The apparatus also senses when the inadvertently off-hook handset is returned on-hook and rapidly restores the automatic-return-to-an-on-hook condition switch to normal operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.