Safety signals
US9803471B2 · kind B2 · utility
1Cited by
1References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2013 |
| Grant date | Oct 31, 2017 |
| Priority date | — |
| Expiry date | Oct 21, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2601
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A subsea system comprises a multiplicity of subsea installations (M-1 . . . M-n) and a common transmission line (2a) in an umbilical for the conveyance of power or data communication electrical signals to the subsea installations. The system provides on the common transmission line a plurality of safety signals (T-1 . . . T-n) in the form of tones separate in frequency from each other and the other signals on the line. Each subsea installation is arranged to receive from the common transmission line selectively a respective one of the safety signals for the control of a fail-safe device (9) in the installation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.