Shock preventing telephone handset for paystation
US5418851A · kind A · utility
0Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1994 |
| Grant date | May 23, 1995 |
| Priority date | — |
| Expiry date | Mar 31, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/18
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Shock prevention elements for use in a telephone paystation handset consisting of a pair of polyester dielectric elements positioned over associated transmitter and receiver units so as to block high voltage potentials resulting from application of collect and refund signals applied to the paystation from an associated telephone central office.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.