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
Clinching method and tool for performing the same
Operation management apparatus, operation management method, and program storage medium
Pixel circuit driving method, light emitting device, and electronic apparatus
Method, apparatus, and system for deciphering media content stream
Methods and apparatus for the composition and communication of digital composition coded multisensory messages (DCC MSMs)
Spacer lithography
Graphical display of actions for handling medical items
  Randomly Featured Patents
Sheet material work bench
Method of processing avocado pulp
Suitcase for arranging golf equipment, convertible to a golf cart
Sanitary napkin
Composite coupling
Methods and apparatus for training and operating voice recognition systems
Motor control apparatus and image forming apparatus
Tap socket
Sample rate converter
Shunt barrier in pulse oximeter sensor