Self-dispensing spaced electronic markers

Details Self-dispensing spaced electronic markers Self-dispensing spaced electronic markers

1989-11-17

1991-09-03

Thomas, Alexander S.

Stock material or miscellaneous articles

Hollow or container type article

428 77, 405157, 324326, 156 68, B32B 108, F16L 5700

Patent

active

050453688

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.

REFERENCES:
patent: 4119908 (1978-10-01), Cosman et al.
patent: 4449098 (1984-05-01), Nakamura et al.
patent: 4767237 (1988-08-01), Cosman et al.

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