|
US4157659A
|
Oil well instrumentation system |
Expired / Lapsed
|
1978-02-27 |
1979-06-12 |
10 |
Details
|
|
US3899631A
|
Inflatable sealing element having electrical conductors ext… |
Expired / Lapsed
|
1974-04-11 |
1975-08-12 |
4 |
Details
|
|
US2778432A
|
Packer braid reinforcing and retainer |
Expired / Lapsed
|
1956-03-15 |
1957-01-22 |
0 |
Details
|
|
US2611437A
|
High pressure inflatable packer |
Expired / Lapsed
|
1948-12-17 |
1952-09-23 |
0 |
Details
|