Patent · US Expired

Electrical heating resistance element

US7164103B2 · kind B2 · utility

2Cited by

13References

7Claims

0Family size

Assignee

Sandvik Intellectual Property AB · SE

Inventors

Jan-Erik Andersson · Tumba, SE
Emil Eriksson · Stockholm, SE
Jörgen Sahlström · Hallstahammar, SE

Key dates

Filing date	Mar 7, 2003
Grant date	Jan 16, 2007
Priority date	—
Expiry date	Mar 7, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH05B3/64
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electrical resistance heating element having a glow zone and two power supply terminals. The glow zone of the element is tubular. A tubular union is provided between each of the power supply terminals and a respective end of the glow zone, wherein the inner diameter of the union is smaller than the inner diameter of the glow zone. A transition region extends between each union and a respective glow zone end and has a progressively decreasing wall thickness in the direction from the union toward the glow zone.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.