| Patents for F27B 5 - Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated (2,607) |
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| 05/26/1992 | US5116221 Internal heat exchange tubes for industrial furnaces |
| 05/06/1992 | EP0483596A1 Vacuum furnace for the thermal treatment of metallic workpieces |
| 05/05/1992 | US5109918 Device for the thermal treatment or organic and inorganic substances |
| 04/22/1992 | CN2102484U Three ring type carbon products baking furnace |
| 04/08/1992 | CN2101203U Symmertry industry frequency induction combined smelting furnace |
| 03/25/1992 | CN2099947U Microwave pressure-resistant sintering furnace |
| 03/25/1992 | CN2099946U Constant temp. delay automatic control box type high temp. electric stove |
| 03/24/1992 | US5098070 Furnace atmosphere reforming catalystic agitator |
| 03/18/1992 | CN2099289U Flame isolating tunnel kiln |
| 03/18/1992 | CN2099288U Ring type sintering machine |
| 03/17/1992 | US5097114 For application in a furnace |
| 02/12/1992 | CN1015479B Apparatus for and method of chromizing articles |
| 02/12/1992 | CN1015474B Vacuum furnace for heat treatment of metallic workpieces |
| 01/29/1992 | CN2094713U Vertical reflection roaster |
| 01/08/1992 | CN2092729U Muffle furnace for continuous heating metallic wire |
| 12/25/1991 | CN2091439U Sintering machine igniter furnace |
| 12/18/1991 | EP0461306A1 Induction smelting furnace |
| 12/12/1991 | DE4107097A1 Closure device for heat treatment appts. |
| 12/11/1991 | EP0460484A2 Closure device for a heat treatment installation |
| 12/11/1991 | CN1015066B Process for heat treatment of metallic workpieces |
| 12/10/1991 | US5072094 Tube furnace |
| 12/04/1991 | CN2090035U Negative-supply auto-clean vacuum cementing furnace |
| 12/04/1991 | CN2089936U Electric internal thermal reducing furnace using new smelting mg |
| 12/03/1991 | US5070232 Optical coating pyrolizer |
| 11/14/1991 | DE4014630A1 Oven providing rapid uniform heating of metallic workpieces - has several flow channels, rotatable gas flow distributor and encircling vacuum pressure chamber |
| 11/06/1991 | CN1014613B Vacuum induction furnace |
| 10/23/1991 | EP0452561A2 Electric heating device |
| 10/22/1991 | CA1290940C Furnace for heat treatment in vacuo with cooling by a stream of gas |
| 10/16/1991 | CN2086883U Coal-burning chemical furnace with function of fume reducing |
| 10/01/1991 | US5052923 Oven for partial heat treatment of tools |
| 10/01/1991 | CA1289998C Electric oven, namely for heat processes |
| 09/18/1991 | EP0447363A1 Discharging device in an installation of various thermic treatments |
| 09/18/1991 | CN2084938U Dual-purpose arsenic extracting furnace |
| 09/11/1991 | CN2084595U Box type protective atmosphere heating power saving resistance furnace |
| 08/08/1991 | DE4101867A1 Retort-type heat-treatment furnace |
| 08/07/1991 | CN2082389U Sinstered core of ore material |
| 08/07/1991 | CN1013459B Inductive sintering furnace for cloisonne |
| 07/30/1991 | US5035611 Apparatus for controlling gas flows in vacuum furnaces |
| 07/30/1991 | US5035610 Internal heat exchange tubes for inductrial furnaces |
| 07/30/1991 | US5035404 Retort assembly for kroll reductions |
| 07/25/1991 | WO1991010873A1 Heating apparatus for semiconductor wafers or substrates |
| 07/23/1991 | US5033927 Device for carrying out sequential thermal treatments under a vacuum |
| 07/11/1991 | WO1991009976A1 Apparatus and method for cooling a furnace load |
| 07/03/1991 | CN2080157U Mired field microwave sintering cavity with orientational reflective mirror |
| 07/03/1991 | CN2080156U Vaccum sintering device |
| 06/19/1991 | CN1052366A High efficient power saving medium temperature electric resistance furnace |
| 05/28/1991 | US5018707 Heating furnace |
| 05/22/1991 | CN2077532U Improved sealing ring for externally heated forging furnace |
| 05/15/1991 | CN2077102U Continuous low-temp. radiation heating furnace |
| 05/08/1991 | CN2076663U Continuous high-temp. heating furnace |
| 04/17/1991 | EP0422353A2 Furnace for the partial thermic treatment of tools |
| 04/10/1991 | EP0420939A1 Apparatus for and method of chromizing articles. |
| 04/03/1991 | CN2074440U Sintering ignition device with multi-jet burning nozzle |
| 04/03/1991 | CN2074439U Internal thermal electric heating furnace |
| 03/13/1991 | CN2073100U 15m electrothermal membrane fritting frunace |
| 03/13/1991 | CN1049903A Vertical pressurized continuous sintering furnace and its production method |
| 03/06/1991 | EP0415811A1 Heat treatment furnace with cooling means |
| 02/05/1991 | US4990754 Apparatus for transmitting heat under vacuum by grains |
| 01/23/1991 | CN1048728A Agitator for atomosphere reforming in continuous heat-treating furnace |
| 01/16/1991 | EP0408325A1 Catalytic agitators for the modification of furnace atmospheres |
| 01/09/1991 | CN2069095U Induction retort furnaces for cloisonne enamel |
| 12/26/1990 | CN2068221U Integral iron casting electric furnace |
| 12/12/1990 | EP0401811A1 Apparatus for the thermal treatment of organic and inorganic materials |
| 12/05/1990 | EP0401172A1 A heating mantle with a porous radiation wall |
| 12/04/1990 | US4974334 Gas flow through vibrating atea |
| 11/13/1990 | US4969941 Furnace for heating glass preform for optical fiber and method for producing glass preform |
| 11/07/1990 | EP0395884A1 Pressure vessel for hot isostatic pressing with means for cooling |
| 11/07/1990 | CN2065307U Refractory brick with inclined steps for resistance heating furnace |
| 11/07/1990 | CN2065196U Oxidation-free annealer |
| 10/31/1990 | CN1046597A Inductive sintering furnace for cloisonne |
| 10/24/1990 | CN2064492U Sintering ignitors of curtain type |
| 10/17/1990 | EP0392889A1 A heating furnace |
| 10/17/1990 | CN1046218A Means of controlling gas flow in vakuum furnaces |
| 10/03/1990 | EP0389889A1 Operational device for gas streams in vacuum furnaces |
| 09/30/1990 | CA2013083A1 Means of controlling gas flows in vacuum furnaces |
| 09/26/1990 | CN2062813U Intermittent sintering furnace of powdered coal ash haydite |
| 09/26/1990 | CN2062737U Directly heating furnace for preparing composite electrode |
| 09/26/1990 | CN1009757B Apparatus and method for feeding sintering raw mix |
| 09/19/1990 | EP0388333A1 Apparatus for performing sequences of continous heat treatments in vacuum |
| 09/18/1990 | US4957431 Heating mantle with a porous radiation wall |
| 09/04/1990 | US4954684 Vertical type heat-treating apparatus and heat-treating method |
| 08/29/1990 | CN2061265U Backheating type continuous sintering resistance furnace |
| 08/15/1990 | CN2060531U Low energy consumption internal heating si reduction mg-smelting furnace |
| 08/01/1990 | CN1008998B Equipment for vertical kiln sintering |
| 05/22/1990 | US4927359 Fluid distribution apparatus |
| 05/15/1990 | US4925388 Apparatus for heat treating substrates capable of quick cooling |
| 05/09/1990 | CN2056990U Core of energy-saving vacuum resistance stove with double firepots |
| 04/18/1990 | EP0286636B1 Process and device for drying and/or burning powdery materials |
| 03/27/1990 | US4912302 Furnace for sintering ceramics, carbon heater used therefor and process for sintering ceramics |
| 03/20/1990 | US4909732 Heat treating furnace |
| 03/14/1990 | EP0357898A2 Industrial furnace, in particular a chamber-type furnace for the heat treatment of metallic objects |
| 03/14/1990 | CN1040394A Metallurgical device (cn) |
| 03/07/1990 | CN1007085B Microwave oven |
| 03/06/1990 | US4907245 Furnace with convection-free hot zone |
| 03/06/1990 | US4906182 Gas cooling system for processing furnace |
| 02/14/1990 | CN1039624A Apparatus for and method of chromizing articles |
| 02/08/1990 | DE3826651A1 Seal for a thermal insulation |
| 01/03/1990 | CN2050576U Full carbofrax energy-saving heat-treating box type resistance furnace |
| 12/28/1989 | WO1989012701A1 Apparatus for and method of chromizing articles |
| 12/13/1989 | CN2049337U Composition electric resistance furnace |