Communications: electrical – Selective – Having indication or alarm
Patent
1974-08-19
1976-09-07
Wilbur, Maynard R.
Communications: electrical
Selective
Having indication or alarm
340 3T, G01V 100, H04B 1300, H04R 1500
Patent
active
039797139
ABSTRACT:
Seismic exploration method applicable to marine surveys. It involves making a dual spread of detectors which are spaced apart vertically. The signals received at one of the spreads are subtracted from corresponding signals received at the other spread. This eliminates horizontally travelling energy signals by cancellation.
REFERENCES:
patent: 3331050 (1967-07-01), Kilmer et al.
patent: 3757287 (1973-09-01), Bealor, Jr.
Blum T. M.
Dearborn Henry C.
Ries C. G.
Texaco Inc.
Whaley T. H.
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