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
Toothbrush holder
Non-volatile memory array and device using erase markers
Dual gate electronic memory cell and device with dual gate electronic memory cells
Terminal box assembly
Voltage regulators with improved wake-up response
Method and apparatus for filter-less class D audio amplifier EMI reduction
Switched capacitor hold-up scheme for constant boost output voltage
  Randomly Featured Patents
Methods of post-contact back end of the line through-hole via integration
Power supply topology for a multi-processor controller in an electric traction system
Dynamic calibration method for single and multiple video capture devices
Method of partitioning large transistor design to facilitate transistor level timing
Use of nitric oxide to enhance the efficacy of silver and other topical wound care agents
Broad-range antibacterial composition and process of applying to food surfaces
Memory-controller-parallelism-aware scheduling for multiple memory controllers
Method and system for controlling intake flow between direct and helical intake passages of intake port of internal combustion engine
Door trim connector connecting structure
Location tracking device and base charging unit