| 发明名称 |
INTERNAL PIPE SEALING SYSTEM |
| 摘要 |
An internal pipe sealing system comprising a sealing device and seal installation equipment. The sealing device is constructed of an outer elastic sealing member and an inner expandable retainer member.
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| 申请公布号 |
US3678560(A) |
申请公布日期 |
1972.07.25 |
| 申请号 |
USD3678560 |
申请日期 |
1970.05.06 |
| 申请人 |
NORTHERN ILLINOIS GAS CO. |
发明人 |
RAYMOND J. DUFOUR;JAMES J. GRIMM |
| 分类号 |
B29C31/00;F16L55/163;(IPC1-7):F16L55/16 |
主分类号 |
B29C31/00 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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