专利检索 ap:("William Hyland" OR "John H. Hallman") AND inv:"William Hyland" 第 1 页

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发明授权
Maintaining readiness in fire hydrants 有权

公开(公告)号：US06659123B2

公开(公告)日：2003-12-09

申请号：US09939228

申请日：2001-08-24

申请人： William Hyland , John H. Hallman

发明人： William Hyland , John H. Hallman

IPC分类号： E03B712

CPC分类号： E03B9/04 , Y10T137/0318 , Y10T137/5327 , Y10T137/5497

摘要： Fire hydrants are protected from freezing by including potassium formate, preferably at least 10% by weight, in the water enclosed in them during nonuse.