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| Number | Title | Issue Date |
| 7267505 | Mine ventilation panel system A panel system for making mine ventilation structures. The panel system comprises a plurality of elongate metal panels having flanges along sides thereof configured for overlapping one another when the panels are placed in side-by-side relation. When the panels are ... | 09/11/2007 |
| 7232368 | Mine ventilation A mine air crossing includes opposite side walls and a deck extending from side wall to side wall. Each side wall includes a plurality of sections assembled side-by-side and interconnected by quick-connections. Similarly, each deck may include deck sections assemble... | 06/19/2007 |
| 7182687 | Air deflecting mine ventilation structure A mine ventilation structure is incorporated at the intersection of first and second intersecting passages in a mine. The ventilation structure comprises a tunnel-forming construction (e.g., a pair of side walls each walling off at least a portion of a respective mo... | 02/27/2007 |
| 7118472 | Control system for pneumatically-powered door installation A mine door installation has a frame installed in a mine passageway. At least one door leaf is mounted on the frame for swinging movement between open and closed positions. Movement of the door leaf is powered by a pneumatic actuator. A pneumatically-powered control... | 10/10/2006 |
| 7073758 | Pole clamp for partition mount A partition mounting system a system mitigates or eliminates sag, or gaps, between an installed curtain and an abutting surface such as a wall or ceiling. The system accomplishes this in a manner that avoids permanent damage to the wall or ceiling surface. A clamp i... | 07/11/2006 |
| 6955594 | Mine door system including an air pressure relief door A mine door of the present invention is adapted for installation in a mine passageway and includes a leaf adapted for swinging between a closed position and an open position. The leaf may be mounted in a frame, and a stopping wall may surround the frame. When closed... | 10/18/2005 |
| 6938372 | Pneumatically-powered mine door installation with hydraulic checking system A mine door assembly has a frame. At least one door leaf is mounted on the frame for swinging movement between open and closed positions. Movement of the door leaf is powered by a pneumatic actuator. The door installation also has a hydraulic checking system for con... | 09/06/2005 |
| 6846132 | Mine stopping and braces therefor A mine stopping installed in a mine passageway includes a plurality of elongate panels extending generally vertically in side-by-side relation from a floor to a roof of the passageway to at least partially close the passageway. A generally horizontal elongate brace ... | 01/25/2005 |
| 6715961 | Method of supporting mine walls and installing a mine stopping A method of supporting opposite first and second walls of a mine passageway includes providing an elongate beam having opposite first and second ends and a longitudinal axis. The beam is configured to have substantial columnar strength for bearing a substantial long... | 04/06/2004 |
| 6688813 | Mine stopping and method of installing same A portable wall section for incorporation in a mine stopping or for use as a mine permanent stopping or seal form, comprising vertically extensible panels secured in side-by-side relation, a stopping installed in a mine, a stopping system utilizing one or... | 02/10/2004 |
| 6682263 | Multiple tier stopping and method of constructing stopping A mine stopping installed in a mine passageway includes a lower tier of elongate panels extending generally vertically in side-by-side relation from a floor of the passageway. Each panel of the lower tier has a lower end adjacent the floor and an upper en... | 01/27/2004 |
| 6669551 | Mine ventilation structure and deck panels therefor A mine ventilation structure with a deck made up of panels of inverted channel shape modified to be of relatively light weight yet strong.... | 12/30/2003 |
| 6594954 | Mine door installation A power mine door installation utilizing compressed air from the compressed air system available in the mine as the power source for a hydraulic door-operating mechanism.... | 07/22/2003 |
| 6554699 | Screening arrangement in a ventilation system An arrangement for screening off a ventilated space (5) in a floor construction arranged on a subfloor (2) and having joists (6) that are supported by a plurality of level-adjusting spacer screws (8) resting on the subfloor (2) to create a free passage (9... | 04/29/2003 |
| 6457906 | Mine stopping A mine stopping installed in a mine passageway having air flowing through the passageway in a first direction includes a rigid wall extending across the passageway to close the passageway and an opening in the wall to permit the passage of air therethroug... | 10/01/2002 |
| 6450735 | Method and equipment for ventilating underground workings A method and kit for installing a stopping in a mine opening includes securely fixing in the mine opening a screen of a size of about 2 to 24 mesh, preferably about 10 to 20 mesh, most preferably about 12 to 16 mesh, and applying a mortar to the screen to... | 09/17/2002 |
| 6425820 | Mine door power drive system A mine door system including at least two doors positioned in a mine passageway in spaced relation forming an airlock. The doors include at least one leaf movable between open and closed positions to allow passage into and out of the airlock. A control sy... | 07/30/2002 |
| 6422790 | Foam blocks for construction of mine tunnel stoppings A light weight foam block being substantially rectangular in shape, having horizontal and/or vertical pairs of tongues and grooves around its perimeter enabling it to interlock with horizontally and/or vertically adjacent blocks to construct a mine stoppi... | 07/23/2002 |
| 6419324 | Method of sealing off a mine passageway A method of sealing off a mine passageway. The method involves installing a plurality of vertical panels side by side across the passageway to form a stopping. The stopping has gaps between adjacent panels and gaps between the panels and adjacent mine sur... | 07/16/2002 |
| 6402611 | Hinged mine stopping The hinged mine stopping has at least two panels joined by a hinge defining a wall adapted for forming an air tight seal in a mine passageway to improve mine ventilation. Each panel has a lower section defined by a sheet of gas impermeable material mounte... | 06/11/2002 |
| 6379084 | Mine stopping A stopping system for use in mines. The stopping system includes a king post truss for reinforcing the stopping panels against excessive deflection due to a pressure differential across the stopping panels. The truss has a variable length to accommodate c... | 04/30/2002 |
| 6361430 | Balanced ventilation doors A pair of door-sections make up a mine ventilation door. The door-sections are hinged to the side-walls of the passage. One of the door-sections opens upstream and the other downstream, so one is blown open, and the other blown closed, by winds passing th... | 03/26/2002 |
| 6334738 | Prefabricated metal overcast having a crushable lower section A ventilation overcast comprises a frame member that defines a structure having a substantially inverted U-shape with first and second opposed side wall portions and a roof portion. A curtain member having a plurality of longitudinal corrugations therein ... | 01/01/2002 |
| 6264549 | Mine ventilation A tunnel-forming overcast structure for incorporation in the installation of an overcast construction at the intersection of two intersecting passages in a mine, each passage constituting an airway for flow of air for mine ventilation having an upstream a... | 07/24/2001 |
| 6220785 | Mine stopping, method of constructing same and panels thereof A permanent mine stopping comprising two spaced-apart metal walls with a filling in the space therebetween keyed or adhesively bonded to the walls and having sufficient strength in tension to constitute the walls and the filling as a permanently integrate... | 04/24/2001 |
| 6164871 | Mine stopping having a swinging door A mine stopping comprising a wall extending across a passageway in a mine to close the passageway. The wall has an opening therein. A door is hinged adjacent the opening for swinging between a closed position in which the door closes the opening to inhibi... | 12/26/2000 |
| 6129483 | Prefabricated metal overcast having a crushable lower section A ventilation overcast may comprise a plurality of support columns, each of which has an upper end and a lower end. A plurality of cross beams are connected between the upper ends of each of the plurality of support columns so that the support columns and... | 10/10/2000 |
| 6056638 | Mine ventilation wall construction A ventilation passage system for a mine having a main shaft from which several branch shafts may extend, wherein each shaft has a generally flat floor and ceiling, the system being constructed of a series of substantially rectangular panels arrayed in at ... | 05/02/2000 |
| 5879231 | Mine ventilation structure A mine ventilation structure used to block a passageway or to prevent mixture of ventilation air at the intersection of two passageways. The passageway has sidewalls and a ceiling. The ventilation structure is formed of panels, each of the panels having s... | 03/09/1999 |
| 5725327 | Permanent mine bulkhead seal and method for constructing same A water-resistant mine bulkhead or seal is provided in which two walls are constructed across the mine entry. One of the walls is constructed in layers. After a lower portion of the layered wall is erected, a first layer of gravel is provided between the ... | 03/10/1998 |
| 5466187 | Mine ventilation structure A mine ventilation structure for installation at the intersection of first and second passageways in a mine. The ventilation structure defines a first passage communicating with the first passageway and a second passage communicating with the second passa... | 11/14/1995 |
| 5385504 | Permanent ventilation seal A mine seal is provided in which two walls are constructed across the mine entry. One of the walls is constructed in layers. After a lower portion of the layered wall is erected, a first layer of gravel is provided between the walls. The gravel is then sa... | 01/31/1995 |
| 4601320 | Industrial door A pressure differential compensating door includes a curtain for closing a doorway having a first upper end, a second lower end and side edges and a curtain winding mechanism having the first end of the curtain attached thereto for raising and lowering th... | 07/22/1986 |
| 4516879 | Foam slabs in mine tunnel stoppings A stopping for use in improving underground mine ventilation comprising an assembly of wall elements, said wall elements comprising: (a) a plurality of rigid blocks, and (b) a plurality of compliant sealing members. The rigid blocks and compliant sealing membe... | 05/14/1985 |
| 4397224 | Sheet metal attachment system and method for installation of mine brattices A sheet metal attachment system and method for the installation of underground mine brattices of the type in which a gas impervious barrier of malleable sheet metal is retained on a peripheral framework of slotted beams. The fastening system involves pre-... | 08/09/1983 |
| 4388779 | Easy-to-open, pressure-resistant door assembly Between regions of different air pressure, a door pivots on an axis located a substantial distance from the nearest edge; this edge moves inwardly as the door pivots about the door axis in a first phase of opening movement to relieve the difference in pre... | 06/21/1983 |
| 4370003 | Temporary gas seal for gas level drift of an in situ oil shale retort A temporary gas seal is provided in a gas level drift of an in situ oil shale retort system which includes a production region having a panel of retorts producing gaseous and liquid products and an adjacent retort preparation region where a panel of in si... | 01/25/1983 |
| 4265486 | Apparatus for in-situ retorting Apparatus for the in-situ retorting of carbonaceous deposits includes a plurality of retorts connected to a common exhaust tunnel effectively free of broken shale into which products of the retorting are discharged. To allow simultaneous mining, rubblizat... | 05/05/1981 |
| 4096702 | Mine stopping device and method of constructing same A mine stopping device and method of constructing same utilizing a plurality of laterally spaced substantially vertically disposed support members extending from the floor to the ceiling of a mine tunnel with a wire mesh screening secured thereto and exte... | 06/27/1978 |
| 4055074 | Window method for measuring leakage A method of measuring fluid leakage around or through a barrier. In the preferred embodiment, the leakage measured was around a permanent mine stopping. To make the measurements a temporary test stopping with two windows was erected near the permanent sto... | 10/25/1977 |
