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
Systems and methods for processing supplemental information associated with media programming
System and method for managing self-refresh in a multi-rank memory
Focus information generating device and focus information generating method
Antenna arrangement and antenna housing
Method and system for filtering home-network content
Method and apparatus for linking a web browser link to a promotional offer
Dispensing of restricted goods
  Randomly Featured Patents
Method for determining the vertical on moving objects and the device for its determination
Electric steering system for rapidly increasing damper gain after steering speed exceeds a specific value
Method and apparatus for correlating video and film images produced from electronic data
Recording medium type discrimination apparatus, recording apparatus, and discrimination method
Refrigeration system
Heterobicyclic and tricyclic nitric oxide synthase inhibitors
Mask pack comprising cosmetic cotton-like material prepared from paper mulberry
Gas passage shifting device
Liquid crystal display device and method for fabricating the same
Process for the production of primary and/or secondary amines from oxo compounds