.~ With heater-unit housing, casing, or support means (e.g., frame and single sheet) {13}
534
.~.~ Rigid tubular housing, casing, or support (e.g., flattened tube)
DEFINITION
Classification: 219/534
(under subclass 520) Subject matter wherein the significant housing, casing or support structure comprises rigid tubes. The structure usually comprises a flattened tube but may include tubes adapted to have the heating unit mounted in such a manner as to allow the material to be heated to flow through or be contained within the housing.
SEE OR SEARCH THIS CLASS, SUBCLASS:
300, for liquid heater wherein the liquid conveying tube is
the heater unit.
301, for liquid heater wherein the heater unit is attached to or surrounds the liquid conveying tube.
306+, for liquid heater, wherein the heater unit is enclosed within the liquid conveying path.
374, for fluid heater wherein the heating element is directly in the fluid path. 544, for heater unit structure wherein the resistance element is embedded within or surrounded by a core sheath or support.
