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
Removable storage device and method for identifying drive letter of the removable storage device
Non-serialized electronic product registration system and method of operating same
Method and apparatus for distributing promotional materials
Active gate drive circuit
High power fiber amplifier with stable output
Image forming apparatus with an improved density adjustment unit
Decrementing settings for a range of power caps when a power cap is exceeded
  Randomly Featured Patents
Heat dissipating audio systems and methods thereof
Switchable diesel fuel filter assembly
Process for forming a permanently elastic adhesive connection easily detachable in case of disassembly
High density coaxial switching jack
Gradient coil system for a nuclear magnetic resonance tomography apparatus
1-Amino-2,7-di-[5'-(2"-chloro-4"-substituted amino-1,3,5-triazin-6"-ylamino)-2'-sulfophenylazo]-3,6-disulfonic acids
Cover of an electronic device having surface ornamentation
Pancake reel hub
Audio mixer architecture using virtual gain control and switching
Method and system for purifying water