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US 4,063,991 AGranted
Method of increasing voltage withstanding capability of vacuum interrupters
AssigneeGeneral Electric Company
InventorsGeorge A. Farrall, William A. Gilhooley, Frank G. Hudda
Life of this patent
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Abstract
Loose glass particles in a vacuum interrupter, and glass attached to the interrupter midband, are removed with an etch of hydrofluoric acid applied over the entire interior of the glass envelope and the midband, following a grit blast of the entire interior of the glass envelope and the midband.
Claims6
In the method of fabricating a vacuum interrupter, said interrupter including a glass envelope and a metallic member cast into said envelope, the method of increasing the voltage withstanding capability of said interrupter comprising the steps of:
- blasting the interior of said envelope with gas-propelled grit;
- and etching the interior of said envelope, including said metallic member, so as to remove loose glass particles and glass adhering to said member.
Dependencies are inferred from the claim text.