US PATENT SUBCLASS 122 / 498
.~ Doors

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

Internet Version by PATENTEC © 1999      Terms of Use


122 /   HD   LIQUID HEATERS AND VAPORIZERS

497  DF  FRONTS {2}
498.~ Doors

DEFINITION

Classification: 122/498

(under subclass 497) Subject matter relating to furnace doors. There may or may not be a circulatory communication with the boiler. The door may be employed to heat water for any purpose or to generate steam.

SEE OR SEARCH CLASS

110, Furnaces,

180, for air-cooled furnace doors.

202, Distillation: Apparatus,

242+, for distillation apparatus closures.