| |
 |
|
Class Information
Number: 464/21
Name: Rotary shafts, gudgeons, housings, and flexible couplings for rotary shafts > Flexible coupling between fluid-conducting rotary shafts (e.g., coupling between sections of drill string, etc.) > Including member deformable by relative movement between shafts > Member is coiled spring
Description: Subject matter wherein said part is a helically wound resilient device.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6834889 |
Torque release coupling for use in drill strings |
Dec. 28, 2004 |
| 5083623 |
Hydraulic shock absorber |
Jan. 28, 1992 |
| 4512424 |
Tubular spring slip-joint and jar |
Apr. 23, 1985 |
| 4343369 |
Apparatus for drilling straight portion of a deviated hole |
Aug. 10, 1982 |
| 4233820 |
Flexible drill pipe |
Nov. 18, 1980 |
| 4181344 |
Running tool |
Jan. 1, 1980 |
| 4149391 |
Flexible drill pipe |
Apr. 17, 1979 |
| 4130000 |
Drill string shock absorber |
Dec. 19, 1978 |
| 4106779 |
Automatic sequential dual action sealing system |
Aug. 15, 1978 |
| 4031713 |
Flexible drill pipe |
Jun. 28, 1977 |
| 4031716 |
Automatic sequential dual action sealing system |
Jun. 28, 1977 |
| 3963228 |
Drill string shock absorber |
Jun. 15, 1976 |
| 3958649 |
Methods and mechanisms for drilling transversely in a well |
May. 25, 1976 |
|
|
|
