| IPC 7 English version |
| F27D-F27D02304 |
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| SECTION F – MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
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| F 27 | 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] |
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| F 27 D | 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) |
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| Note |
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| 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. |
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| Subclass Index |
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| CONSTRUCTIONAL FEATURES |
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| HANDLING AND SUPPORTING CHARGE |
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| PREHEATING CHARGE; COOLING; USING WASTE HEAT OR GASES |
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| ARRANGEMENTS OF ELECTRIC HEATING ELEMENTS |
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| ARRANGEMENTS OF CONTROL AND SAFETY DEVICES |
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| OTHER FEATURES; OTHER DETAILS |
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1/ | 00 | Casings; Linings; Walls; Roofs (refractory materials C04B; firebridges for combustion chambers F23M 3/00) |
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1/ | 02 | . | Crowns; Roofs |
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1/ | 04 | . | characterised by the form of the bricks or blocks used |
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1/ | 06 | . | . | Composite bricks or blocks |
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1/ | 08 | . | . | . | Bricks or blocks with internal reinforcement or metal backing |
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1/ | 10 | . | Monolithic linings; Supports therefor |
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1/ | 12 | . | incorporating cooling arrangements (constructions of tube assemblies in general F28) |
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1/ | 14 | . | Supports for linings (F27D 1/10 takes precedence) |
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1/ | 16 | . | Making or repairing linings |
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1/ | 18 | . | Door frames; Doors, lids, removable covers |
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3/ | 00 | Charging; Discharging; Manipulation of charge (conveying systems characterised by their application for specified purposes not otherwise provided for B65G 49/00; moving charge through a furnace F27B 9/14) |
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3/ | 02 | . | Skids or tracks for heavy objects |
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3/ | 04 | . | Ram or pusher apparatus |
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3/ | 06 | . | Charging or discharging machines on travelling carriages |
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3/ | 08 | . | Screw feeders; Screw dischargers |
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3/ | 10 | . | Charging directly from hoppers or shoots |
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3/ | 12 | . | Travelling or movable supports or containers for the charge |
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3/ | 14 | . | Charging or discharging liquid or molten material |
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3/ | 15 | . | Tapping equipment; Equipment for removing slag |
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3/ | 16 | . | Introducing a fluid jet or current into the charge (F27D 3/18 takes precedence) [3] |
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3/ | 18 | . | Charging particulate material using a fluid carrier [3] |
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5/ | 00 | Supports, screens, or the like for the charge within the furnace (travelling or movable supports F27D 3/12) |
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7/ | 00 | Forming, maintaining, or circulating atmospheres in heating chambers |
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7/ | 02 | . | Supplying steam, vapour, gases, or liquids |
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7/ | 04 | . | Circulating atmospheres by mechanical means |
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7/ | 06 | . | Forming or maintaining special atmospheres or vacuum within heating chambers (F27D 7/02 takes precedence) |
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9/ | 00 | Cooling of furnaces or of charges therein (F27D 1/00, F27D 3/00 take precedence) |
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11/ | 00 | Arrangement of elements for electric heating in or on furnaces (electric heating per se H05B) |
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11/ | 02 | . | Ohmic resistance heating |
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11/ | 04 | . | . | with direct passage of current through the material being heated |
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11/ | 06 | . | Induction heating, i.e. in which the material being heated, or its container or elements embodied therein, form the secondary of a transformer |
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11/ | 08 | . | Heating by electric discharge, e.g. arc discharge |
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11/ | 10 | . | . | Disposition of electrodes (automatic control of temperature G05D 23/00; electric discharge apparatus H01T; arrangements for feeding or guiding electrodes H05B 7/10; automatic control of power by positioning of electrodes H05B 7/144) [3] |
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11/ | 12 | . | with electromagnetic fields acting directly on the material being heated |
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13/ | 00 | Apparatus for preheating charges; Arrangements for preheating charges |
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15/ | 00 | Handling or treating discharged material; Supports or receiving chambers therefor |
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15/ | 02 | . | Cooling |
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17/ | 00 | Arrangement for using waste heat (heat-exchangers per se F28); Arrangement for using, or disposing of, waste gases (removing fumes in general B08B 15/00) |
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19/ | 00 | Arrangement of controlling devices |
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21/ | 00 | Arrangement of monitoring devices; Arrangements of safety devices |
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21/ | 02 | . | Observation or illuminating devices |
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21/ | 04 | . | Arrangements of indicators or alarms |
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23/ | 00 | Details or accessories not covered by any preceding group |
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23/ | 02 | . | Devices for removing incrustations |
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23/ | 04 | . | Stirring devices for molten material (mixing in general B01F) [3] |
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