US PATENT SUBCLASS 432 / 171
.~.~.~ Diverse atmospheres (e.g., directly and indirectly heated, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


432 /   HD   HEATING

120  DF  WORK CHAMBER HAVING HEATING MEANS {12}
159  DF  .~ Combustion products heat work by contact {19}
163  DF  .~.~ Plural structurally related work chambers {3}
171.~.~.~ Diverse atmospheres (e.g., directly and indirectly heated, etc.)

DEFINITION

Classification: 432/171

(under subclass 163) Apparatus in which the two chambers are substantially noncommunicating and contain or are supplied with gases of distinctly different chemical compositions as work chamber atmospheres.

SEE OR SEARCH THIS CLASS, SUBCLASS:

18, for a process of heating or heater operation, including passing work through diverse or temperature graduated treating zones.