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
Method and apparatus for managing network traffic
System and method for a driver circuit with a referenced control signal
Managing personal information on a network
Spatially pre-processed target-to-jammer ratio weighted filter and method thereof
Image decolorizing device
N-phenyl-(homo)piperazinyl-benzenesulfonyl or benzenesulfonamide compounds suitable for treating disorders that respond to the modulation of the serotonin 5-HT.sub.6 receptor
MRAM with sidewall protection and method of fabrication
  Randomly Featured Patents
Intraluminal stent
Safety device in an operating unit for an industrial robot
Multitenant hosted virtual machine infrastructure
Duffel bag
Printed circuit board standoff
Dual stage-dual mode low emission gas turbine combustion system
Sensor for the determination of electrolyte concentrations
Exposure apparatus and method wherein the magnification of the projection optical system compensates for physical changes in the substrate
Method and system for facilitating marketing dialogues
Method and apparatus for making twisted pair multi-conductor ribbon cable with intermittent straight sections