| |
 |
|
Class Information
Number: 367/81
Name: Communications, electrical: acoustic wave systems and devices > Wellbore telemetering
Description: Subject matter wherein information or control signals are transmitted through a passageway in the earth in the form of acoustic waves in a medium in the passageway comprised of material different from the surrounding earth.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4157659 |
Oil well instrumentation system |
Jun. 12, 1979 |
| 4115753 |
Fiber optic acoustic array |
Sep. 19, 1978 |
| 4073341 |
Acoustically controlled subsurface safety valve system |
Feb. 14, 1978 |
| 4066994 |
Well data telemetry by explosions |
Jan. 3, 1978 |
| 4031826 |
Detonation system and method |
Jun. 28, 1977 |
| 4019148 |
Lock-in noise rejection circuit |
Apr. 19, 1977 |
| 4015234 |
Apparatus for measuring and for wireless transmission of measured values from a bore hole transmitter to a receiver aboveground |
Mar. 29, 1977 |
| 4003017 |
Continuous bit positioning system |
Jan. 11, 1977 |
| 3977245 |
Down hole apparatus for sensing and storing values of physical parameters |
Aug. 31, 1976 |
| 3965983 |
Sonic fluid level control apparatus |
Jun. 29, 1976 |
|
|
|
