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
Method for detection and characterization of a microorganism in a sample using time-dependent intrinsic fluorescence measurements
Wind energy system having a connection protection device
Case for electronic device
Method of manufacturing nitride semiconductor and nitride semiconductor element
Transaction cost recovery queue management
Authentication for social networking messages
Tie down strap hook
  Randomly Featured Patents
Genomic plant sequences and uses thereof
Light emitting device having a light extraction structure
Measuring device comprising a movable measuring probe
Sensor using two tunable oscillators connected to a frequency mixer comprising a device for calibrating the frequency of the output signal and a process for calibrating this frequency
Aqueous ink, and ink-jet recording method, ink-jet recording apparatus, and image forming method using the same
Coated conductor thick film precursor
Tire tread
Reaction of organic diisocyanates with water
Separate lubricating system of engines
Driving method for local dimming of liquid crystal display device and apparatus using the same