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 of inhibiting fibrogenesis and treating fibrotic disease
Expertise discovery methods and systems
Nested Mach-Zehnder modulator
Illumination source with reduced inner core size
Rate selection for an OFDM system
Variable rate fuser release fluid application
Automatic gain control for implanted microphone
  Randomly Featured Patents
4-azahexacyclododecane compounds
Continuous variable-gain low-noise amplifier
Packaging and applicator devices and kits, and methods of application
Switch-mode power supply
Long-time and short-time overcurrent signal processor for circuit breaker static trip units
Method and apparatus for measuring blood pressure and pulse rate
Method of making a T-shirt grocery bag having a coupon
Method and apparatus for monitoring the transport of an object
Post storage rack
Security model using security domains in a security model applied to abstract database