Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Mine stopping having a swinging door










Image Number 4 for United States Patent #6164871.

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 inhibit the passage of air therethrough, a first open position in which the door is moved in one direction away from the closed position, and a second open position in which the door is swung in an opposite direction away from the closed position. The door is movable to either of the first and second open positions when the door is subjected to substantial concussive air pressure thereby to permit concussive air to pass through the opening in both directions.








 
 
  Recently Added Patents
Compositions and methods using microspheres and non-ionic contrast agents
Die seal ring
High performance strained source-drain structure and method of fabricating the same
Epoxy composition for encapsulating an optical semiconductor element
Disk drive
Flashlight
HSP20 inhibits amyloidogenesis and neurotoxicity
  Randomly Featured Patents
Boot for hydraulic, hydropneumatic or pneumatic piston-cylinder units
Randomly dispersed metal fiber mat
Shippable postcard/envelope
Field coil assembly for an electromagnetically actuated clutch
Thermally protected vacuum hose assembly
Distributed environmental/load control system
Method and apparatus for ultrasound block measurement
Spine fixation instrumentation
HTLV-I and HTLV-II peptide antigens and methods
Composite pigmentary material