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
Method of producing and decoding error correction code and apparatus therefor
Structured placement for bit slices
Computing device display screen with computer-generated notification feature
Hanging pot water indicator
Subframe staggering for relay communication
Optical device and image pickup device and image pickup system using the same
Switch, information processing apparatus, and address translation method
  Randomly Featured Patents
Methods and devices for treating pulmonary vasoconstriction and asthma
Systems and methods for structured variable resolution information dissemination and discovery
Coating film transfer tool
Method for handling an electronic request with the aid of an intermediary entity
Electronic fiber optic switch with optical interconnect
Single track vertical and horizontal recording read/write head design
Passive radiator and system comprising the passive radiator
Method and apparatus for characterizing the flowability of toner particles
Tablecloth covering and method of covering and skirting a table
Apparatus for treating lipstick and like substances