Switch testing
US4692939A · kind A · utility
5Cited by
1References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 19, 1986 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Mar 19, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Switches of telephone grids are tested for delayed action subsequent to, but within a number of milliseconds after, actuating the opening or closing of the switches. Excessive delay indicates approaching failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.