F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
LIGHTING AND HEATING
 F27
FURNACES; KILNS; OVENS; RETORTS (specially adapted for a purpose covered by a single other class and specifically mentioned per se in that class, see the class in question, e.g. bakery ovens A21B, coke or gas-making apparatus C10B, C10J, apparatus for craking hydrocarbons C10G, blast furnaces C21B, Bessemer converters for making steel C21C, furnaces for heat treatment of metal C21D, enamelling ovens C23D, combustion apparatus F23; electric heating H05B)
 F27

Note(s)

  1. This class deals with furnaces, kilns, ovens, retorts, open sintering apparatus, and details or accessories therefor, in general. It includes the arrangement of electrical heating elements in or on furnaces, but not the elements themselves. It is not concerned with the processes carried on within the furnaces.
  2. In this class: Where appropriate, the term "furnaces" is to be understood as covering 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 accompanying the class title (F27)


 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 per se F23)
 F27D

Note(s)

Attention is drawn to the references and notes accompanying the class title (F27)