发明名称 |
ELEKTRONISCHE MARKIERER MIT VORBESTIMMTER UNTERBRECHUNG. |
摘要 |
A marked conduit allowing electronic location of the conduit after burial, having a plurality of electronic markers spaced thereon at predetermined intervals. The distance between the markers encodes information about the buried conduit. The markers are preferably passive circuits tuned to a specific frequency. The markers may be oriented in a predetermined pattern to encode additional information, and may be attached to the outer or inner surface of the conduit, or imbedded in the wall of the conduit. |
申请公布号 |
AT117093(T) |
申请公布日期 |
1995.01.15 |
申请号 |
AT19900912818T |
申请日期 |
1990.08.16 |
申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
COSMAN, ARMOND, D.;MINAROVIC, JOE, T.;WORBOYS, DAVID, C.;KNIPPELMIER, GARY, H. |
分类号 |
G01V3/00;F16L1/11;G01V3/12;G01V15/00;G02B6/44;(IPC1-7):G01V3/12;F16L1/024 |
主分类号 |
G01V3/00 |
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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