Patents Assigned to Davidson Hydrant Technologies, Inc.
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Patent number: 7775231Abstract: The present invention relates to methods and devices for retrofitting fire hydrants with 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 a replacement hydrant body having an enlarged diameter portion that can be installed to replace an existing hydrant body. The replacement hydrant body can include a secondary valve comprising a seat, biasing structure, and a restriction member to 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.Type: GrantFiled: August 14, 2007Date of Patent: August 17, 2010Assignee: Davidson Hydrant Technologies, Inc.Inventors: Tom R. Davidson, Sr., David Phillips, Anthony Ferrari, David Michael Walden
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Patent number: 7766027Abstract: The present invention relates generally to methods and devices for providing a fire hydrant with a vented steamer port cap assembly to allow air and water to pass through an upper area of a fire hydrant. Various embodiments include hydrants with a vented steamer port cap assembly. In other embodiments, a secondary valve is included in the barrel of the fire hydrant to controllably allow liquid to flow through the hydrant.Type: GrantFiled: March 13, 2008Date of Patent: August 3, 2010Assignee: Davidson Hydrant Technologies, Inc.Inventors: Tom R. Davidson, Sr., Anthony Ferrari, Carlos Moreno
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Patent number: 7575017Abstract: Wet barrel 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 or water conduit otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open and/or a pump is connected to the nozzle. Such valves preferably open automatically when water is flowing from the water supply through the nozzle, but close off portions of the barrel when the nozzle is open and water is not flowing through the nozzle.Type: GrantFiled: October 6, 2006Date of Patent: August 18, 2009Assignee: Davidson Hydrant Technologies, Inc.Inventors: Thomas Dewey Davidson, Sr., David Michael Walden, Anthony Ferrari, David Phillips, O. G. Sims, Matthew Jesse Rose
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Patent number: 7428910Abstract: The present invention relates to methods and devices for providing a fire hydrant actuator rod with additional structure for allowing air to reach the area of a fire hydrant below a secondary valve. Various embodiments include an actuator rod with openings and hollow portions and configured to provide air from the area of a hydrant above the secondary valve to the area of a hydrant below a secondary valve. In some embodiments of the present invention, a check valve is provided with the actuator rod that is adapted to prevent the flow of fluid in at least one direction.Type: GrantFiled: March 9, 2006Date of Patent: September 30, 2008Assignee: Davidson Hydrant Technologies, Inc.Inventors: Tom R. Davidson, Sr., Anthony Ferrari, David M. Walden, Matthew J. Rose
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Patent number: 7240688Abstract: The present invention relates to methods and devices for retrofitting fire hydrants with 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 a seat and elongated member for efficient and cost effective installation and cooperation with 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.Type: GrantFiled: March 2, 2006Date of Patent: July 10, 2007Assignee: Davidson Hydrant Technologies, Inc.Inventors: Thomas Dewey Davidson, Sr., Anthony Ferrari, David Michael Walden, Matthew Jesse Rose
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Patent number: 7174911Abstract: 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.Type: GrantFiled: November 2, 2005Date of Patent: February 13, 2007Assignee: Davidson Hydrant Technologies, Inc.Inventor: Thomas Dewey Davidson
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Patent number: 7055544Abstract: 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.Type: GrantFiled: November 23, 2004Date of Patent: June 6, 2006Assignee: Davidson Hydrant Technologies, Inc.Inventor: Thomas Dewey Davidson
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Patent number: 6868860Abstract: 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.Type: GrantFiled: December 4, 2002Date of Patent: March 22, 2005Assignee: Davidson Hydrant Technologies, Inc.Inventor: Thomas Dewey Davidson