Method of manufacturing an insulating coupling for drill collars
US4589187A · kind A · utility
22Cited by
10References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1984 |
| Grant date | May 20, 1986 |
| Priority date | — |
| Expiry date | Jan 23, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49982
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An insulating coupling for drill collars and a method of manufacture thereof are presented wherein the coupling consists of an electrically insulating ceramic coating applied in thickness from 0.002 to 0.006 inch to the threads of the coupling by a detonation gun process and sealed with an epoxy sealer to reduce porosity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.