Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Wild card auto completion
Method for evaluating performance characteristics of dental curing lights
Baseball themed hand clap maraca
Optical channel transport unit frames transmission having interleaved parity
Aromatic amine derivative, organic electroluminescent element employing the same, and process for producing aromatic amine derivative
Stable liquid VEGF antagonist formulations
Method and apparatus for the prevention of a service degradation attack
  Randomly Featured Patents
Integrated circuit devices including insulating support layers
Process for the preparation of catalytic systems for the oxidative dehydrogenation of alkylaromatics or paraffins
Welded chain wheel
Horizontal continuous casting apparatus
Image blur prevention apparatus with rewritable memory for storing image blur response
Static bar code reader
Composition and method for forming biodegradable implants in situ and uses of these implants
Arithmetic circuit with multiplexed addend inputs
Reclaiming space from a file system
Golf ball