公开(公告)号：US3600526A

公开(公告)日：1971-08-17

申请号：US3600526D

申请日：1968-12-10

Applicant: BELL TELEPHONE LABOR INC

Inventor： PILKINTON DONALD C

IPC: H04Q3/00 ,  H04M3/22

CPC classification number: H04Q3/00

Abstract: I disclose an arrangement for holding up a connection from the called end in a telephone switching system. Gradual insertion of holding bridges across the transmission paths of all switches serving a particular subscriber line eliminates acoustical disturbances. Responsive to a called subscriber signal, a bridge containing the emitter-collector path of a transistor is placed across the transmission paths by slowly biasing the transistor into conduction.

公开(公告)号：US3383470A

公开(公告)日：1968-05-14

申请号：US38631064

申请日：1964-07-30

Applicant: BELL TELEPHONE LABOR INC

Inventor： DOHERTY JR GEORGE F ,  FISCHER WILLIAM A ,  MILTON KLEIN ,  PILKINTON DONALD C ,  WALSH RICHARD A ,  WYNDRUM RALPH W

IPC: H04Q3/00

CPC classification number: H04Q3/0004

公开(公告)号：US3223786A

公开(公告)日：1965-12-14

申请号：US20275162

申请日：1962-06-15

Applicant: BELL TELEPHONE LABOR INC

Inventor： PILKINTON DONALD C

IPC: H04Q1/32

CPC classification number: H04Q1/32

公开(公告)号：US3178518A

公开(公告)日：1965-04-13

申请号：US12329861

申请日：1961-07-11

Applicant: BELL TELEPHONE LABOR INC

Inventor： PILKINTON DONALD C

IPC: H04Q3/62

CPC classification number: H04Q3/625