Electric heating – Heating devices – With heater-unit housing – casing – or support means
Reexamination Certificate
2006-06-20
2006-06-20
Hoang, Tu (Department: 2832)
Electric heating
Heating devices
With heater-unit housing, casing, or support means
C219S221000, C219S544000
Reexamination Certificate
active
07064300
ABSTRACT:
A method and apparatus achieves making a surface-analysis determination precedent to allowing an electrofusion welding operation on pipe stock which is prescribed to be scraped, skinned or cleaned of surface contaminants prior to being graded ‘passable’ for such electrofusion welding. The method and apparatus utilizes non-contacting probes affixed to the welding power-supply leads such that inspection is automatic on the applicable pipe section(s) contemporaneously prior to enabling power-supply to the hot-wire welding coils. If the applicable pipe section fails the inspection, the welding equipment is disabled until the probes are disassembled, and then re-assembled for a succeeding inspection, such that during the interim an operator presumptively rectifies the situation as by re-scraping or skinning the applicable pipe section.
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Bay Jonathan A.
Hoang Tu
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