EP 0308899 A3 19900314 - ULTRASONIC TRANSDUCER WITH ASTIGMATIC TRANSMISSION-RECEPTION CHARACTERISTICS

Title (en)

ULTRASONIC TRANSDUCER WITH ASTIGMATIC TRANSMISSION-RECEPTION CHARACTERISTICS

Publication

EP 0308899 A3 19900314 (DE)

Application

EP 88115485 A 19880921

Priority

DE 3732410 A 19870925

Abstract (en)

[origin: EP0308899A2] Ultrasonic transducer (1) whose astigmatic transmission/reception characteristic is based on grooves or slots (3, 13) which are aligned in parallel in one direction (4) in the diaphragm (2). <IMAGE>

IPC 1-7

G10K 13/00; G10K 11/32

IPC 8 full level

H04R 17/00 (2006.01); G10K 9/122 (2006.01); G10K 11/32 (2006.01); G10K 13/00 (2006.01)

CPC (source: EP)

G10K 9/122 (2013.01); G10K 11/32 (2013.01); G10K 13/00 (2013.01)

Citation (search report)

[Y] EP 0037620 A1 19811014 - PHILIPS CORP [US]
[YD] EP 0075302 A1 19830330 - GELHARD EGON
[A] FR 2293844 A1 19760702 - BARCUS LESTER [US]
[A] US 2716708 A 19550830 - GEOFFREY BRADFIELD
[A] PATENT ABSTRACTS OF JAPAN, Band 102, Nr. 90 (P-503), 2. Oktober 1982; & JP-A-59 230 224 (HITACHI LTD) 28-05-1986

Designated contracting state (EPC)

AT DE FR GB IT

DOCDB simple family (publication)

EP 0308899 A2 19890329; EP 0308899 A3 19900314; DE 3732410 A1 19890413; JP H01119200 A 19890511

DOCDB simple family (application)

EP 88115485 A 19880921; DE 3732410 A 19870925; JP 23866388 A 19880922