Circulation sub for in-hole hydraulic motors
US3989114A · kind A · utility
32Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Mar 17, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B4/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
This invention relates to circulation subs used in connection with hydraulic in-hole motors with means for selectively interrupting circulation through the circulation sub.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.