Liquid heaters and vaporizers – Stand boiler – And condition responsive feature
Reexamination Certificate
2008-07-01
2008-07-01
McAllister, Steven B. (Department: 3749)
Liquid heaters and vaporizers
Stand boiler
And condition responsive feature
C122S014310, C122S014100, C122S013010, C137S072000, C137S074000
Reexamination Certificate
active
07392766
ABSTRACT:
A liquid heating appliance, representatively a water heater, is provided with protective apparatus for preventing rupture of its liquid storage tank portion caused by overheating of pressurized liquid therein. Illustratively, the protective apparatus includes a length of thermoplastic tubing, preferably polybutylene tubing, whose interior is exposed to the tank interior so as to be pressurized by heated liquid therein. In the event of a liquid overheating condition in the tank, the tubing is heat-softened in a manner reducing its burst pressure and causing it to burst, at a pressure substantially below the tank burst pressure, and thereby form a pressure relief outlet passage for the tank. A shield structure with at least one fluid outlet opening therein extends outwardly around the thermoplastic tubing to diffuse pressurized fluid escaping from the burst tubing.
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Haynes and Boone LLP
Juettner Andrew M
McAllister Steven B.
Rheem Manufacturing Company
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