Communications: electrical – Selective – Interrogation response
Patent
1974-02-13
1976-04-06
Engle, Samuel W.
Communications: electrical
Selective
Interrogation response
310 84, 310 91, 340 9, H04B 1300
Patent
active
039493490
ABSTRACT:
Electroacoustic transducers are nested to provide a centrally vibrating portion and a peripherally vibrating portion. The phases of the two transducers may be adjusted with respect to each other in order to provide a variety of beam patterns.
REFERENCES:
patent: 2963681 (1960-12-01), Morgan
patent: 3457547 (1969-07-01), Akervold et al.
patent: 3478309 (1969-11-01), Massa, Jr.
patent: 3505639 (1970-04-01), Chervenak
Massa Donald P.
Massa Frank
Dellorfano, Jr. Fred M.
Engle Samuel W.
Massa Donald P.
Tudor Harold
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