US PATENT SUBCLASS 431 / 232
.~ Section heated by distinct flame holders, one fed by heated section

Current as of: June, 1999
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431 /   HD   COMBUSTION

207  DF  HEATED LINE SECTION FEEDS FLAME HOLDER {19}
232.~ Section heated by distinct flame holders, one fed by heated section

DEFINITION

Classification: 431/232

(under subclass 207) Apparatus in which a feed line section heated by the fed flame holder is also heated by a second flame holder; e.g., the initial vapor for an oil vapor burner is generated by a gas burner and the continuing vapor by the oil vapor burner.