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
Isolated SCR ESD device
Semiconductor device having trapezoidal shaped trenches
Process for the production of an acylation catalyst
Hybrid interconnect scheme including aluminum metal line in low-k dielectric
Probe for ultrasound diagnostic apparatus
Disk drive
Testing SQL query writing skills
  Randomly Featured Patents
Random access audio/video processor with compressed video resampling to allow higher bandwidth throughput
Golf putting hole with flag
Lighting apparatus for a model lighthouse
Microwave oven
Taxane analogs for the treatment of brain cancer
Treatment of platelet derived growth factor related disorders such as cancers
(Oxo)sulfonium complex, polymerizable composition containing the complex, and method of polymerizing the composition
Process for sulfonating of polymers containing dicarboxylic acid cyclic imide units
Method and structure for forming relatively dense conductive layers
Temperature-indicating sleeve and related container