Patent · US Expired

Ceramic electrical resistor

US3996168A · kind A · utility

11Cited by

2References

21Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Gunther Hoffmann · Eningen unter Achalm, DE
Helmut Schmelz · Prien am Chiemsee, DE

Key dates

Filing date	Feb 4, 1974
Grant date	Dec 7, 1976
Priority date	—
Expiry date	Feb 4, 1994

Classification

Technology area (CPC H)Electricity
CPC primaryH01C7/025
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Ceramic electrical resistors having a positive temperature-resistance coefficient, consisting of barium titanate with an atomic excess of titanium, and having a ferroelectric perowskite structure, the resistor being conductive by the presence therein of a rare earth dopant, the resistor also containing one or more of the following elements: cobalt, chromium, nickel, vanadium, manganese and copper. The resistor composition also desirably containing significant amounts of silicon.

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