Memory operated well tools
US4740897A · kind A · utility
5Cited by
10References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1985 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Mar 29, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/07
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A self-contained, down hole powered electrical system in which the tool has nonvolatile memory means which are independent of applied power thereby permitting the power to the system to be turned off between sampling and further including a system for reentering data to nonvolatile memories for retention during high temperature operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.