Stock material or miscellaneous articles – Sheet facing and longitudinally noncoextensive with web or...
Patent
1989-09-18
1991-05-21
Thomas, Alexander S.
Stock material or miscellaneous articles
Sheet facing and longitudinally noncoextensive with web or...
428136, 428137, 428906, 428 99, 324326, 324 67, 405157, F16L 5700, G01V 308
Patent
active
050174150
ABSTRACT:
A marker tape for location of a buried conduit, having a plurality of electronic markers spaced thereon at predetermined intervals. The distance between the markers encodes information about the buried conduit. The tape may be a nonconductive ribbon or cord, and the markers are preferably passive circuits tuned to a specific frequency. The tape ribbon embodiment may include slots therein for receiving the markers. The markers may be oriented in a predetermined pattern to encode additional information.
REFERENCES:
patent: 993516 (1976-05-01), Cosman et al.
patent: 4761656 (1988-08-01), Cosman et al.
patent: 4767237 (1988-08-01), Cosman et al.
Five page brochure from SENTRY-LINE-copyright notice date of 12/1985.
Cosman Armond D.
Knippelmier Gary H.
Minarovic Joe T.
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Musgrove Jack V.
Thomas Alexander S.
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