Patent · US Expired

Valve metal powders and process for producing them

US7066979B2 · kind B2 · utility

6Cited by

7References

14Claims

0Family size

Assignee

H.C. STARCK INC. · US

Inventors

Josua Löffelholz · Langelsheim, DE
Hady Seyeda · Vienenburg, DE
Rudiger Wolf · Vienenburg, DE
Karlheinz Reichert · Wolfenbüttel, DE
Christoph Schnitter · Ottersberg, DE

Key dates

Filing date	Mar 7, 2003
Grant date	Jun 27, 2006
Priority date	—
Expiry date	Apr 17, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P10/25
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Process for producing a valve metal powder by producing a precursor of desired morphology, converting the precursor into an oxide of the valve metal, stabilizing the structure of the oxide by heat treatment and reducing the stabilized oxide while retaining the morphology. Valve metal powders obtainable in this way, in particular comprising spherical agglomerates with a mean agglomerate size of 10–80 μm, preferably 20–40 μm, and use of these valve metal powders to produce solid electrolyte capacitors.

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