Lighted telephone
US5029205A · kind A · utility
Inventor
Key dates
| Filing date | Nov 30, 1989 |
| Grant date | Jul 2, 1991 |
| Priority date | — |
| Expiry date | Nov 30, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/802
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone handset that has a light bulb disposed on it has a special switch that allows the light to automatically illuminate upon using the phone. The switch changes from an open position to a closed one upon a change in the orientation of gravity. One embodiment of the switch includes a hollow chamber having two separate contact plates disposed at one end and a freely sliding conductive manner that comes into contact with the contacts upon picking up the phone. A second switch embodiment includes three parallel pins with a central one the pins having a hanging pivoting member that serves to contact one of the other pins upon a change in gravitational orientation. Also included is a removable socket member to facilitate replacement of the bulb.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.