Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
John David Swan0
Date of Patent
June 7, 2011
Patent Application Number
10420213
Date Filed
April 21, 2003
Patent Primary Examiner
Patent abstract
A plumbing system operable to automatically introduce antifreeze into the hot and cold water systems responsive to a signal from a controller. The controller activates the system automatically at a predetermined ambient temperature. The system can also be reconfigured manually.
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