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, apparatus and article for detection of transponder tagged objects, for example during surgery
Position pointer, variable capacitor and inputting apparatus
Phase-amplitude 3-D stereo encoder and decoder
Moulded tie strips
Systems and methods for determining muscle force through dynamic gain optimization of a muscle PID controller for designing a replacement prosthetic joint
Method for using extended security system, extended security system and devices
Mobile communication apparatus
  Randomly Featured Patents
System and process for handling, prepping, tagging and shipping plants
Voltage controlled oscillator, PLL circuit, pulse modulation signal generating circuit, semiconductor laser modulation device and image forming apparatus
Street sweeper
Single-panel triage assessment tag
Method for handling service requests in a mobile telecommunication network
Suction cleaner bag
Microwave electron gun
Apparatus and method of separating and concentrating organic and/or non-organic material
Coin type lithium ion capacitor
Conduit splice component