Patent · US Active

Key switch

US8314721B2 · kind B2 · utility

4Cited by

5References

6Claims

0Family size

Assignees

Inventors

Huan Xu · Shanghai, CN
Duo Liu · Dortmund, DE

Key dates

Filing date	Apr 29, 2009
Grant date	Nov 20, 2012
Priority date	—
Expiry date	Sep 5, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH01H13/64
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A key switch can generate several signals is provided. The key switch includes a key top, a body, a first electronic circuit, a second electronic circuit, and a switch mechanism. Pressing the key top, the switch key generates a first signal while the first electronic circuit is closed by the switch mechanism; the switch key generates a second signal while the second electronic circuit is closed; and the switch key generates a third signal while both the first electronic circuit and the second electronic circuit is closed.

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