Electric lamp and discharge devices – With gas or vapor
Reexamination Certificate
2007-09-07
2011-10-18
Walford, Natalie (Department: 2879)
Electric lamp and discharge devices
With gas or vapor
C313S637000, C313S636000, C445S023000
Reexamination Certificate
active
08040061
ABSTRACT:
An opaque zone in the polycrystalline (PCA) discharge vessel of a high intensity discharge lamp may be made by creating residual pores in predetermined regions of the final-sintered discharge vessel. The control over the placement of the opaque zone is achieved by forming a carbonaceous residue in a specific region of the discharge vessel prior to final sintering. During sintering, the carbonaceous material causes residual porosity in the sintered PCA. The higher emissivity of the opaque PCA provides localized cooling in order to provide more control over the condensate behavior in the discharge vessel.
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Huettinger Roland
Tarry Christopher A.
Wei George C.
Clark Robert F.
Osram Sylvania Inc.
Walford Natalie
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