Title:
【発明の名称】自己分配式離間電子マーカー
Document Type and Number:
Japanese Patent JPH05500110
Kind Code:
A
Abstract:
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.
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Inventors:
Cosman, Almond Dee.
Minarovic, Joe Tee.
War Boys, David Sea.
Nipple Meier, Gary H.
Minarovic, Joe Tee.
War Boys, David Sea.
Nipple Meier, Gary H.
Application Number:
JP51225890A
Publication Date:
January 14, 1993
Filing Date:
August 16, 1990
Export Citation:
Assignee:
Minnesota Mining and Manufacturing Company
International Classes:
F16L1/11; G01V3/12; G01V3/00; G01V15/00; G02B6/44; (IPC1-7): G01V3/00; G01V3/12
Attorney, Agent or Firm:
Aoki Akira (4 outside)