Resources Contact Us Home
Fire hydrant with a second valve

Image Number 4 for United States Patent #7055544.

Fire hydrants which feature additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include valves which close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open. Such valves preferably open, manually or automatically, when water is flowing from the water supply through the nozzle, a condition which renders it difficult at best to introduce toxins through the hydrant into a water supply, but close off portions of the barrel when the nozzle is open and water is not flowing through the nozzle.

  Recently Added Patents
Error detection and recovery tool for logical volume management in a data storage system
Meat-containing, strip shaped food product and method of making same
Wire guide
Memory with separate read and write paths
Method and apparatus for controlling a multi-node process
Method of fabricating semiconductor light emitting device
Facial recognition using a sphericity metric
  Randomly Featured Patents
Synthesis of crystalline silicoaluminophosphates and use in olefin production
I.S. machine
Container for plastic bags
Micro connector assembly and method of making the same
Decoding of forward error correction codes in the presence of phase noise and thermal noise
Image quality correction circuit and method based on color density
Tenon forming tool
Fishing lure
System and method for electron-beam lithography
Motor apparatus