Electric lamp and discharge devices – With gas or vapor – Electrode composition
Reexamination Certificate
2011-01-04
2011-01-04
Roy, Sikha (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
Electrode composition
C313S623000, C313S541000, C313S637000
Reexamination Certificate
active
07863818
ABSTRACT:
The invention relates to a barrier layer provided on the electrode assembly of a discharge lamp comprising at least a layer of nanoclusters of a non-oxidizing material. Further, the invention relates to an electrode assembly for a discharge lamp comprising an electrode having a foil attached thereto to create an electrode assembly, the assembly being coated with a multi-layer coating comprising at least a layer of non-oxidizing material in the form of nanoclusters, and at least another layer of non-oxidizing material, such that the total coating thickness is up to 1500 nm. A method to reduce thermal expansion mismatch between an electrode assembly and a discharge lamp envelope is also provided, the method comprising providing an electrode assembly and depositing on the surface of the assembly a coating having at least a nanocluster layer of a non-oxidizing material, and subsequently subjecting the lamp envelope in the electrode assembly area to pinching to create a pinch area, this lamp being able to operate at elevated temperature for extended periods, in excess of 1000 hours.
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Fay Sharpe LLP
General Electric Company
Roy Sikha
LandOfFree
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