Patent · US Active

Field emission cathode and x-ray tube embodying same

US7778391B2 · kind B2 · utility

4Cited by

3References

28Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Jens Fuerst · Herzogenaurach, DE
Stefan Popescu · Erlangen, DE
Georg Wittmann · Herzogenaurach, DE

Key dates

Filing date	Jun 4, 2009
Grant date	Aug 17, 2010
Priority date	—
Expiry date	Jun 4, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH01J35/305
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A field emission cathode has a field emitter and an extraction grid, and the field emitter and the extraction grid can be moved relative to one another. Such a field emission cathode is highly durable and exhibits a longer lifespan. An x-ray tube has a field emission cathode composed of a field emitter and an extraction grid that can be moved relative to one another. Such an x-ray tube is highly durable and exhibits a longer lifespan.

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