Time recorder for in-hole motors
US4387774A · kind A · utility
4Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 4, 1981 |
| Grant date | Jun 14, 1983 |
| Priority date | — |
| Expiry date | May 4, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B45/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Real time responsive devices are mounted at the inlet to an in-hole motor to measure the interval of time during which drilling fluid circulates through the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.