Electric heating – Heating devices – With heater-unit housing – casing – or support means
Reexamination Certificate
2006-07-25
2006-07-25
Pelham, Joseph M. (Department: 3742)
Electric heating
Heating devices
With heater-unit housing, casing, or support means
C219S522000, C219S534000, C219S548000, C219S553000, C392S480000
Reexamination Certificate
active
07081602
ABSTRACT:
A heater comprising a conduit made of corundum (e.g. synthetic sapphire) and having a wall forming a closed cross-section with an interior surface, and an exterior surface. At least one of the interior and exterior surfaces may have a roughened portion comprising inclusions and corresponding protrusions formed substantially continuously therethroughout. An electrically resistive coating may extend substantially continuously over, in, and around the inclusions and protrusions of at least a part of the roughened portion to form a conformal cross-section having a thickness selected to promote bending thereof to accommodate annular expansion and contraction occurring in response to a differential in the coefficients of expansion between the electrically resistive coating and the conduit.
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Pate & Pierce & Baird
Pelham Joseph M.
Trebor International, Inc.
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