Heater utilizing copper-nickel alloy core
US5060287A · kind A · utility
348Cited by
22References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1990 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Dec 4, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B36/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An electrical resistance heater is provided which utilizes a copper-nickel alloy heating cable. This metallurgy heating cable is significantly less prone to failure due to localized overheating because the alloy has a low temperature coefficient of resistance. Used as a well heater, the heating cable permits heating of long segments of subterranean earth formation with a power supply of 400 to 1200 volts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.