03974475 is referenced by 28 patents and cites 8 patents.

An apparatus for focusing ultrasonic waves in a focal line by an ultrasonic optical system having at least one rotation-symmetrical, non-spherical acoustical reflection surface which together with an ultrasonic transducer element transmits an at least partially convergent ultrasonic field having an annular cross-section.

Title
Method of and apparatus for focusing ultrasonic waves in a focal line
Application Number
294066
Publication Number
3974475
Application Date
August 28, 1974
Publication Date
August 10, 1976
Inventor
Heinz Hoffmann
Grenzach
DT
Pierre Andre Grandchamp
Arlesheim
CH
Christoph Benedikt Burckhardt
Muttenz
CH
Agent
Mark L Hopkins
Bernard S Leon
Samuel L Welt
Assignee
Hoffmann La Roche
NJ, US
IPC
H04B 11/00
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