Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-01-04
2000-04-11
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
3405721, 3405729, 175 26, 175 40, G08B 1314
Patent
active
060492791
ABSTRACT:
A transponder conduit end cap includes a transponder housing having two flat, generally parallel walls defining a cavity, a transponder located in the housing, and a fitting which attaches the transponder housing to the end of a conduit, to thereby seal the conduit. The transponder axis is maintained in a predetermined orientation (e.g., vertical), such as by partially filling the cavity with a liquid, and using a buoyant envelope to contain the transponder. Alternatively, the vertical orientation may be maintained by pivotally supporting the transponder from a trunnion attached to an interior of the housing. The transponder can be supported by the trunnion using a loop attached to an end of the transponder, the loop being placed about an annular chamfer of the trunnion to allow spherical articulation. The transponder can be active or passive.
REFERENCES:
patent: 4951758 (1990-08-01), Sonku et al.
patent: 5682141 (1997-10-01), Morimoto
patent: 5720354 (1998-02-01), Stump et al.
patent: 5819859 (1998-10-01), Stump et al.
patent: 5825303 (1998-10-01), Bloss, Jr. et al.
Industrial Technology, OMNI MARKER.TM. Electronic Marker, "A Better Way to Mark and Relocate Buried Facilities."
Lee Benjamin C.
Musgrove Jack V.
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