1
Christoph Benedikt Burckhardt, Pierre Andre Grandchamp, Heinz Hoffmann: Method of and apparatus for focusing ultrasonic waves in a focal line. Hoffmann La Roche, Samuel L Welt, Bernard S Leon, Mark L Hopkins, August 10, 1976: US03974475 (28 worldwide citation)

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 ...


2
Christoph Benedikt Burckhardt, Pierre Andre Grandechamp, Heinz Hoffmann: Echo sounding technique. Hoffmann La Roche, Samuel L Welt, George M Gould, Mark L Hopkins, March 14, 1978: US04079352 (16 worldwide citation)

An ultrasonic echo sounding technique for reducing unwanted echoes from reflectors outside the focal line of a focused ultrasonic field is disclosed. In this technique at least two pulse-defined ultrasonic waves are successively transmitted. The amplitudes of the said waves are functions of an angle ...


3
Christoph Benedikt Burckhardt, Pierre Andre Grandchamp, Heinz Hoffmann: Suppression of out-of-focus echoes in ultrasonic scanning. Hoffmann La Roche, Samuel L Welt, George M Gould, Mark L Hopkins, January 17, 1978: US04069467 (4 worldwide citation)

An improved method and apparatus for reducing the echoes from reflectors disposed outside the focal line in an echo-sounding process using an ultrasonic field focusing in a focal line. A pulsed ultrasonic wave is transmitted having a cross-sectional area corresponding to one or more annularly arrang ...


4
Bruno Marie Joseph Dousse, Christoph Benedikt Burckhardt: Production of images. F Hoffmann La Roche &Amp Co, LI YONG, December 17, 1986: CN86104252

A method of producing an image of an area under investigation, in which method wave pulses generated by a pulsed source of coherent waves are transmitted into the area, the echo waves reflected from reflectors in the area are received and a corresponding electrical echo signal is produced and a firs ...