| Patents for E21F 1 - Ventilation of mines or tunnels; Distribution of ventilating currents (2,288) |
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| 07/13/1999 | CA2217997C Device for facilitating the movement and positioning of a long cylindrical part |
| 07/06/1999 | CA2091752C Structure having quick-connect components |
| 07/06/1999 | CA2072507C Power mine door system |
| 05/27/1999 | DE19752343A1 Connection for ventilation pipe section used in mining or tunneling |
| 05/18/1999 | CA2130718C Nox adsorption and removal apparatus |
| 05/12/1999 | CN1043310C Suction device for removing nitrogen oxide |
| 03/09/1999 | US5879231 Mine ventilation structure |
| 03/09/1999 | US5879057 Horizontal remote mining system, and method |
| 03/03/1999 | CN2309423Y Double-door crossing automatic locking device |
| 03/03/1999 | CN2309422Y Composite plastic flexible positive air duct |
| 10/28/1998 | EP0776446B1 Air moving system |
| 10/08/1998 | WO1998044237A1 System for absorption of the exhaust gases in a tunnel for road traffic |
| 10/07/1998 | CN2293647Y Cage curtain gate |
| 09/24/1998 | WO1998041733A1 Ventilation stopping |
| 08/26/1998 | CN2289057Y Multifunctional air door for mine |
| 05/14/1998 | WO1998019775A1 Method and device for cleaning exhaust air by separating particles and pollutant gases |
| 05/07/1998 | DE19646766A1 Verfahren und Vorrichtung zur Reinigung der Abluft von Partikeln und Schadgasen Method and apparatus for cleaning the exhaust air of particles and harmful gases |
| 03/05/1998 | DE19737625A1 Part cleaning equipment for output air from road tunnels |
| 03/03/1998 | US5722885 Air moving system |
| 02/04/1998 | CN1172204A Fitting process and manufacturing method for seamless wind guide shell |
| 11/04/1997 | US5683294 Temporary brattice for mines |
| 10/08/1997 | CN1161738A Air moving system |
| 08/28/1997 | DE19607306A1 Combined electrostatic and gas filtration system |
| 06/04/1997 | EP0776446A1 Air moving system |
| 06/03/1997 | US5635142 Absorbers with hot air intakes for desorption of nitrogen oxides and regeneration of absorbent |
| 05/07/1997 | EP0772007A2 Jet fan |
| 02/25/1997 | CA2021852C Flexible ducting |
| 01/22/1997 | CN2245664Y Inflatable flexible no-skeleton negative pressure air duct for mine |
| 12/11/1996 | CN2242336Y Device for purifying air in mine tunnel |
| 10/28/1996 | CA2155139A1 Borehole ventilation sealcover |
| 09/04/1996 | CN2234504Y Multi-leaf folding linked air door |
| 04/23/1996 | US5509477 Borehole ventilation sealcover |
| 02/29/1996 | WO1996006313A1 Air moving system |
| 02/20/1996 | US5492676 Denitrification system |
| 11/29/1995 | CN2213850Y Ventilation hose joint |
| 11/14/1995 | US5466187 Mine ventilation structure |
| 10/04/1995 | EP0675263A1 Tunnel dust collecting system |
| 09/13/1995 | CN2207446Y Composite ventilation pipe |
| 07/25/1995 | US5435981 Method of adsorbing and removing nitrogen oxides |
| 06/21/1995 | CN1103813A Suction device for removing nitrogen oxide |
| 05/31/1995 | CN2199627Y Explosion-isolative wind-electricity interlock vacuum electromagnetic starter for mine |
| 05/17/1995 | CN2197460Y Remote controlling pneumatic door |
| 05/09/1995 | US5412916 Structure having quick-connect components |
| 05/03/1995 | CN2196180Y Push rod air door |
| 04/26/1995 | CN2195620Y Fast-filling air partition |
| 03/28/1995 | US5401120 Pumpable mine seal |
| 03/01/1995 | EP0640375A2 NOx adsorption and removal apparatus |
| 02/22/1995 | CN2190159Y Instant wind screen |
| 12/07/1994 | EP0627253A1 Denitrification system |
| 10/26/1994 | CN2180783Y Two-in-one device for mine-well ladder cage wall and combined ventilation pipe |
| 09/07/1994 | EP0613994A1 Tunnel dust collecting system |
| 06/01/1994 | CN2167189Y Electrically driving device for automatically opening air door for mining use |
| 05/03/1994 | US5308280 Method and apparatus for supporting ventilation curtains in coal mines |
| 04/27/1994 | EP0594360A1 Method of adsorbing and removing nitrogen oxides |
| 04/23/1994 | CA2108818A1 Method of adsorbing and removing nitrogen oxides |
| 03/31/1994 | DE4232794A1 Tightness tester for mine and tunnel air ducts - has fan with associated sheet metal duct member with duct coupling flange |
| 03/18/1994 | CA2106273A1 Ventilation tubes |
| 02/16/1994 | EP0489150B1 Method and device for controlling air supply in a network of passages |
| 01/19/1994 | CN2153638Y Locking device for air door |
| 01/05/1994 | EP0577153A1 Aerodynamic air intake opening of a tunnel ventilation unit |
| 12/22/1993 | CN2150336Y Automatic controlling device of wind-electricity locking for monitoring gas |
| 12/14/1993 | US5269660 Method and an installation for adjusting the flow rate of air in a network of ducts |
| 10/27/1993 | CN2144713Y Mining telescopic air duct |
| 09/29/1993 | CN2142884Y Assembled axial-flow main ventilator for mine |
| 09/22/1993 | CN2142499Y Automatic ventilation door locking device |
| 09/01/1993 | CN1021955C Serially connected dust filter for mine ventilation |
| 08/31/1993 | US5240349 Power mine door system |
| 08/18/1993 | EP0555217A1 Method and installation for air treatment in the area of a traffic route for motor vehicles |
| 07/15/1993 | DE4223772A1 Underground-mine suction-ventilator system has dust-extractor - and has fan following extractor giving greater suction than that exhausting air |
| 06/29/1993 | US5222838 Power mine door system |
| 06/08/1993 | US5217406 Mine ventilation tubing system and method of installation |
| 06/02/1993 | CN2135062Y Flexible air duct |
| 05/12/1993 | EP0541487A1 Anchoring device for tended construction elements |
| 05/05/1993 | CN2131981Y Automatic infrared telecontrol device for air door |
| 04/21/1993 | CN2130210Y Mechanical automatic closing interlock device for mine air door |
| 12/29/1992 | US5174682 Mine ventilation overcast |
| 12/09/1992 | CN2124309U Tension spring type air door opening aid |
| 12/03/1992 | DE4117446A1 Connectors for flexible ventilator ducts in mine - consist of basic sheet brought into shape by rings and frustum-shaped end rings |
| 11/25/1992 | CN2122937U Torsional spring air door opening aid |
| 10/28/1992 | CN2120182U Press spring type ventilation door opener aid |
| 10/21/1992 | CN2119503U Shrunk-on glass fibre reinforced plastic air duct |
| 10/21/1992 | CN1018751B Self-controlled gas-removing method and apparatus |
| 09/30/1992 | CN2117471U Two-stage shifting up axial flow ventilator |
| 09/30/1992 | CN2117470U Negtive pressure air duct |
| 09/01/1992 | USRE34053 Mine door system |
| 08/19/1992 | CN1063745A Mine shaft main fan backflow method and device thereof |
| 07/30/1992 | DE4102331A1 Corrugated sheet metal lining segments for underground galleries - are laid against page and backfilled, and weather doors are fixed across gallery |
| 07/22/1992 | CN2110714U High-pressure sealer for underground local ventilating machine in coal mine |
| 07/22/1992 | CN2110713U Leakless ventilating duct connecting hoop for drift and tunnel construction |
| 07/15/1992 | CN2110085U Automatic machine changing device for coal mine well part fan |
| 07/08/1992 | CN2109445U Open and close device for mine shaft ventilation door |
| 07/01/1992 | CN2108800U Open bundling type flexible air duct |
| 06/10/1992 | EP0489150A1 Method and device for controlling air supply in a network of passages. |
| 04/15/1992 | CN2101763U Ventilation conversion type wind reversing device for mine |
| 03/31/1992 | US5100978 Preparation of polyethylene and copolymers of predominant amounts of ethylene |
| 03/10/1992 | US5094273 Ventilation ducting |
| 02/12/1992 | CN2095939U Double leaf guide wind door |
| 01/29/1992 | CN2094619U No-welding type tunnel ventilator |
| 01/08/1992 | EP0465413A1 Device for the suspension of intermediate ceilings |
| 01/03/1992 | WO1992000492A1 Method and device for controlling air supply in a network of passages |