Insulating coupling for drill collars and method of manufacture thereof
US4674773A · kind A · utility
28Cited by
16References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Nov 19, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L25/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.