- 专利标题： Maintaining readiness in fire hydrants
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申请号： US09939228申请日： 2001-08-24
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公开(公告)号： US06659123B2公开(公告)日： 2003-12-09
- 发明人: William Hyland , John H. Hallman
- 申请人： William Hyland , John H. Hallman
- 主分类号： E03B712
- IPC分类号： E03B712
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.
公开/授权文献
- US20030047210A1 Maintaining readiness in fire hydrants 公开/授权日：2003-03-13
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