发明申请
- 专利标题： MANHOLE COVER DEVICE
- 专利标题（中）： 管壳装置
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申请号： US12721351申请日： 2010-03-10
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公开(公告)号： US20110222963A1公开(公告)日： 2011-09-15
- 发明人: John Kelley , David Elder
- 申请人： John Kelley , David Elder
- 主分类号： E02D29/14
- IPC分类号： E02D29/14
摘要：
A rubber manhole cover, suitable for attaching to a top of a metal manhole lid, includes at least two bonded layers of rubber material of differing properties, including a bottom layer of a first rubber material, and a top layer of vulcanized rubber material, the top and bottom layers functioning as a single unit.
公开/授权文献
- US08118517B2 Manhole cover device 公开/授权日：2012-02-21
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