| Patents for E21F 1 - Ventilation of mines or tunnels; Distribution of ventilating currents (2,288) |
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| 01/03/1992 | CA2065252A1 Method and device for controlling air supply in a network of passages |
| 11/28/1991 | DE4016467A1 Protection for flexible plastics underground ventilation shaft - has ventilators at intervals, each adjacent to tubular insert with perforated cover and internal hose |
| 10/03/1991 | WO1991014827A1 Method and installation for air treatment in the area of a traffic route for motor vehicles |
| 10/02/1991 | CN1014164B Flexible sheet material and it use as ventilation stopping curtain |
| 08/07/1991 | CN1053657A Self-controlled gas-removing method and apparatus |
| 07/10/1991 | CN2080561U Auto-opening and -shuting air door for mine |
| 05/29/1991 | DE3941413C1 Joint for underground ventilation ducts - has hose fitted to inside of pipe at area of joint |
| 03/20/1991 | CN2073498U Circulating winde circuit breaking controller |
| 01/30/1991 | EP0410428A2 Tunnel dust collecting system |
| 11/28/1990 | CN1047216A Serially connected dust filter for mine ventilation |
| 11/21/1990 | CN1047128A Anti-explosive local fan for coal mine |
| 11/14/1990 | CN2065669U Full-automatic remote control wind door for mine shaft |
| 10/31/1990 | EP0394794A2 Polyethylene and copolymers with a major proportion of ethylene |
| 10/24/1990 | EP0393686A2 Foldable weather-resistant textile aeration hose with airtight layer, especially for use in underground mining or in tunnel construction, in particular in coal mining. Method and apparatus for manufacturing such an aeration hose |
| 10/17/1990 | EP0392713A1 An improved ventilation system |
| 10/03/1990 | CN1009851B Automatic regulating system for overall ventilation of mines |
| 07/25/1990 | CN2059681U Hemp air duct for mine tunnel |
| 06/20/1990 | CN2058428U Explosion-proof local ventilator combined controlling box |
| 06/06/1990 | CN1008290B Method and installation for preventing main sector of mine shaft from being destroyed by explosive wave |
| 05/31/1990 | DE3839598A1 Air-duct discharge for special ventilation |
| 03/27/1990 | US4911577 Mine door system |
| 03/13/1990 | US4907910 Roof structure for tunnel |
| 02/06/1990 | US4898088 Totally fusible tunnel ventilation damper system |
| 10/04/1989 | CN2045428U Automatic controller for mining local fan |
| 10/03/1989 | CA1262055A1 Roof structure for tunnel |
| 07/26/1989 | CN1034244A Method and installation for preventing the main sector of mine shaft from being destroyed by explosive wave |
| 07/20/1989 | DE3800486A1 Pressure pick-up for detecting an air-conditioning flow including a ventilating conduit and a measuring method |
| 07/06/1989 | DE3805152A1 System for ventilating underground workings, in particular mines |
| 04/12/1989 | CN1032381A Field regulating method of mine axial-flow fan |
| 03/08/1989 | CN2033858U Wind tunnel sensor |
| 02/21/1989 | USRE32871 Mine stopping |
| 12/07/1988 | CN88200986U Air door sensor |
| 11/01/1988 | CA1244116A1 Blasting initiated control system |
| 09/13/1988 | US4770086 Portable ventilation safety device |
| 06/16/1988 | DE3700622A1 Arrangement for measurement transducers in preferably flexible air ducts, in particular of auxiliary ventilation systems in underground operation |
| 06/15/1988 | CN87213227U Closed recirculation loop reversable wind tunnel |
| 05/26/1988 | DE3639996A1 Device for the auxiliary ventilation of underground winning operations, in particular of shortwall faces with only one gate road |
| 05/11/1988 | DE3633350C1 Method of supplying compressed air to the working chamber and the personnel and materials lock of a manhole cylinder and device for carrying out the method |
| 04/20/1988 | CN87103938A Automatic regulating system for overall ventilation of mines |
| 03/17/1988 | DE3630868A1 Air-duct suspension on a selective-cut heading machine |
| 10/14/1987 | EP0240713A1 Controller for tunnel ventilating system |
| 09/23/1987 | EP0237625A1 Device for ventilating a tunnel |
| 09/23/1987 | CN87100086A Ventilating apparatus for tunnels |
| 08/26/1987 | CN87100621A Ventilation stopping curtain |
| 08/18/1987 | US4687790 Mine stopping caulk |
| 06/17/1987 | CN86204269U Metallic wind-reverser |
| 12/30/1986 | EP0205979A1 Tunnel ventilating system |
| 12/02/1986 | US4625631 Method and apparatus for extending ventilation ductwork |
| 09/23/1986 | US4612848 Method and apparatus for moving air across a mineral face |
| 09/09/1986 | CA1210943A1 Mine stopping |
| 08/26/1986 | US4607568 In a mine |
| 12/18/1985 | EP0165145A1 Fan silencer which can be regenerated in situ, for use in ventilation plants fed with dusty air, and process to regenerate this silencer in situ |
| 10/15/1985 | US4547094 Mine stopping |
| 09/24/1985 | US4542681 Mine ventilation line curtain extender |
| 05/21/1985 | US4517767 Mine ventilation door |
| 01/22/1985 | US4494894 Extensible brattice support system for mine face ventilation |
| 04/03/1984 | US4440070 Mobile adjustable curtain apparatus for use in room and pillar coal mining ventilation system |
| 10/18/1983 | CA1155328A1 Auxiliary ventilation system for underground sites |
| 08/16/1983 | US4398451 Method of ventilating underground mines and improved brattice cloth construction useful therein |
| 03/30/1983 | EP0074960A1 Mine ventilation door |
| 12/08/1982 | EP0066000A1 Extension unit for a ventilation tubing |
| 12/08/1982 | EP0065962A1 Coupling for mine ventilation conduits |
| 12/07/1982 | US4362092 Auxiliary ventilation system for underground sites |
| 11/30/1982 | US4361079 Apparatus for extending ventilating conduits |
| 11/09/1982 | US4358139 Coupling for mine ventilation conduits |
| 09/30/1982 | WO1982003245A1 Mine ventilation door |
| 08/17/1982 | US4344357 Apparatus for extending ventilating conduits |
| 06/10/1982 | WO1982001926A1 Coupling for mine ventilation conduits |
| 05/05/1982 | EP0050760A1 Device for elongating a ventilating tubing |
| 08/11/1981 | US4282802 Slideboard device for underground mine face ventilation |
| 04/01/1981 | EP0025862A1 Device for extending colliery air ducts |
| 02/10/1981 | US4249462 Method and apparatus for preventing ice formation at the entrance portal of a mine |
| 11/25/1980 | US4235163 Mine face ventilation system |
| 10/14/1980 | CA1087518A1 Gas withdrawal from an in situ oil shale retort |
| 05/20/1980 | CA1077973A1 Radial mining method |
| 04/29/1980 | US4200036 Ventilation system for automated mining machines |
| 12/25/1979 | US4180352 Extensible brattice and cantilevered roof mounted support system therefor |
| 11/27/1979 | US4175481 Mine ventilation system and elements thereof |
| 11/13/1979 | US4174135 Underground formed wall single-entry mining method |
| 06/05/1979 | US4157204 Face ventilation system for coal mines |
| 02/20/1979 | US4140343 Gas withdrawal from an in situ oil shale retort |
| 02/06/1979 | CA1047824A1 Train tunnel ventilation method and apparatus |
| 01/10/1979 | EP0000307A1 Process for the construction of thin walls of various embodiments, especially of walls for channelling fluids |
| 02/07/1978 | US4072351 Radial mining method |
| 07/26/1977 | US4037862 Flexible ducting joints |
| 07/26/1977 | US4037526 Train tunnel ventilation method and apparatus |
| 03/29/1977 | US4014569 Flexible ducting joint |
| 03/09/1976 | US3943273 Electrically conducting plastic pipe system |