F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING; HEATING
 F27
FURNACES; KILNS; OVENS; RETORTS (specially adapted for a purpose covered by a single other class and specifically mentioned in that class, see the class in question, e.g. bakery ovens A21B, glass melting furnaces C03B, coke or gas-making apparatus C10B, C10J, apparatus for cracking hydrocarbons C10G, blast furnaces C21B, converters for making steel C21C, furnaces for heat treatment of metal C21D; furnaces for electroslag or arc remelting of metals C22B 9/00; enamelling ovens C23D; combustion apparatus F23; electric heating H05B)  [4]
 F27

Note(s)

  1. This class covers:
    • furnaces, kilns, ovens, retorts, open sintering apparatus and other similar apparatus for heat treatment of materials or articles, and details or accessories therefor, in general;
    • the arrangement of electrical heating elements in or on furnaces.
  2. This class does not cover:
    • combustion apparatus per se, i.e. apparatus for direct combination of oxygen gas and a burnable substance; [7]
    • electrical heating elements per se;
    • processes carried on within the furnaces.
  3. In this class, the following term is used with the meaning indicated:
    • "furnaces" covers kilns, ovens, or retorts.
 F27B
FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
 F27B

Note(s)

Attention is drawn to the references and Notes following the title of class F27 and the Note III following the Contents of Section of section H.

 F27B
Subclass index
FURNACES WITH STATIONARY CHARGE
Shaft furnaces 1/00
Horizontal furnaces 3/00, 5/00
Bell-type furnaces 11/00
With progression of heating 13/00
Crucible furnaces, tank furnaces 14/00
STATIONARY FURNACES WITH MECHANICALLY-MOVED CHARGE 9/00
ROTARY FURNACES 7/00, 13/00
OTHER FURNACES; COMBINATIONS 15/00, 17/00; 19/00
OPEN SINTERING OR LIKE APPARATUS 21/00

 F27D
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE (combustion apparatus F23)
 F27D

Note(s)

Attention is drawn to the references and Notes following the title of class F27 and Note III following the Contents of Section of section H.

 F27D
Subclass index
CONSTRUCTIONAL FEATURES 1/00
HANDLING AND SUPPORTING CHARGE 3/00, 5/00, 15/00
PREHEATING CHARGE; COOLING; USING WASTE HEAT OR GASES 13/00; 9/00, 15/02; 17/00
ARRANGEMENTS OF ELECTRIC HEATING ELEMENTS 11/00
ARRANGEMENTS OF CONTROL AND SAFETY DEVICES 19/00, 21/00
OTHER FEATURES; OTHER DETAILS 7/00; 23/00