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
Calendar integration methods and systems for presentation of events having combined activity and location information
Apparatus and method for multiplying frequency of a clock signal
Method and system for coordinating client and host security modules
Browsing or searching user interfaces and other aspects
Security arrangements for extended USB protocol stack of a USB host system
Image signal processing apparatus and image signal processing method
Wireless network device including a polarization and spatial diversity antenna system
  Randomly Featured Patents
Paper moistener device and moist toilet paper dispenser
System and method to bioengineer facial form in adults
Ball for athletic sports
Conversion of contaminated polyethylene terephthalate to decontaminated polybutylene terephthalate
Single package containing multiple integrated circuit devices
Stowable swing away flip seat
Device for containing and dispensing a product
Light guiding member, light detecting device and defect inspecting apparatus
Load disconnection switch
Apparatus and method for controlling focus in a recording system