High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Reexamination Certificate
2007-10-23
2007-10-23
Enad, Elvin (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
C218S136000, C218S155000
Reexamination Certificate
active
11318298
ABSTRACT:
A shielded encapsulated vacuum interrupter with a ceramic vacuum chamber and opposing conductive end caps is provided. One end cap is electrically connected to a fixed contact, while an opposing end cap is connected to a moving contact. The moving contact is actuatable with the fixed contact for opening or closing an electric circuit. A floating shield inside the vacuum chamber connected to the vacuum chamber ceramic wall and spaced from the fixed and moving contacts is isolated and has a floating voltage potential. A portion of the vacuum chamber exterior ceramic wall is coated with a semi-conductive material and conductive voltage screens enclose a portion of the vacuum chamber exterior and are electrically connected to each conductive end cap of the vacuum chamber. The chamber and connected screens are encapsulated in a molded dielectric housing.
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International Search Report, PCT/US04/31103, dated Nov. 18, 2004.
Enad Elvin
Fishman M.
G & W Electric Co.
Michael & Best & Friedrich LLP
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