Fluid handling – Hydrant type – With valve at outlet
Reexamination Certificate
2005-03-22
2005-03-22
Walton, George L. (Department: 3753)
Fluid handling
Hydrant type
With valve at outlet
C137S272000, C137S540000, C137S542000, C137S614200
Reexamination Certificate
active
06868860
ABSTRACT:
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.
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Davidson Hydrant Technologies, Inc.
Kilpatrick & Stockton LLP
Walton George L.
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