Combined pipeline marker and test unit

Details Combined pipeline marker and test unit Combined pipeline marker and test unit

1975-06-20

1978-02-21

Wilbur, Maynard R.

Communications: electrical

Selective

Having electron beam device

73 405A, H04B 1100

Patent

active

040756017

ABSTRACT:
An acoustic type of pipeline marker that has combined with it, as a unitary structure, an acoustic signal detector for determining whether the marker is operating. The detector is only energized when it is desired to check whether the marker is emitting the desired acoustic signals into the pipeline. The detector provides a visual signal.

REFERENCES:
patent: 2820959 (1958-01-01), Bell
patent: 2940302 (1960-06-01), Scherbatskoy
patent: 3102252 (1963-08-01), Bolton
patent: 3561256 (1971-02-01), Bustin et al.
patent: 3685008 (1972-08-01), Bhuta et al.
patent: 3800270 (1974-03-01), Bailey
patent: 3859846 (1975-01-01), Asada et al.
Dean et al., RCA Publication: Digital Integrated Circuits, Mar. 1971, Application Note ICAN 6267.
Guidebook of Electronic CKTS., J. Markus, McGraw-Hill, Inc., pp. 600, 995.

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