公开(公告)号：US2722664A

公开(公告)日：1955-11-01

申请号：US26224851

申请日：1951-12-18

Applicant: BELL TELEPHONE LABOR INC

Inventor： DUNCAN ROBERT S ,  STONE JR HENRY A

IPC: H01F17/04

CPC classification number: H01F17/043

公开(公告)号：US2751497A

公开(公告)日：1956-06-19

申请号：US39828353

申请日：1953-12-15

Applicant: BELL TELEPHONE LABOR INC

Inventor： DUNCAN ROBERT S

IPC: H03B5/12 ,  H03D11/04

CPC classification number: H03D11/04 ,  H03B5/1203 ,  H03B5/1231 ,  H03B5/1296

公开(公告)号：US3573960A

公开(公告)日：1971-04-06

申请号：US3573960D

申请日：1968-12-19

Applicant: BELL TELEPHONE LABOR INC

Inventor： DUNCAN ROBERT S

IPC: G01H1/10 ,  H03H9/125 ,  B05C1/16 ,  B05C3/20

CPC classification number: H03H9/125 ,  G01H1/10

Abstract: A METHOD OF FORMING TORSIONAL MODE ELASTIC WAVE TRANSDUCERS BY EVAPORATING OR OTHERWISE DEPOSITING PIEZOELECTRIC MATERIAL ON AN END SURFACE OF A DELAY LINE AT AN ANGLE TO THIS SURFACE WHILE THE LINE IS ROTATING. THE MATERIAL FORMS A RING WITH THE PIEZOELECTRIC POLARIZATION AND DIRECTION OF SHEAR MOTION CIRCUMFERENTIAL TO SAID RING.

D R A W I N G

公开(公告)号：US3522557A

公开(公告)日：1970-08-04

申请号：US3522557D

申请日：1963-07-19

Applicant: BELL TELEPHONE LABOR INC

Inventor： DUNCAN ROBERT S ,  PARKER MARSENA R JR

IPC: G10K11/32 ,  H03H9/13 ,  H03H9/40 ,  H03H9/30

CPC classification number: H03H9/40 ,  G10K11/32

公开(公告)号：US2838737A

公开(公告)日：1958-06-10

申请号：US47718354

申请日：1954-12-23

Applicant: BELL TELEPHONE LABOR INC

Inventor： DUNCAN ROBERT S

IPC: H01F17/04

CPC classification number: H01F17/043